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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.
41

[pt] A UTILIZAÇÃO DE BLOCKCHAIN PARA CONTROLE DA CADEIA DE DISTRIBUIÇÃO DE COMBUSTÍVEIS DERIVADOS: PROPOSTA DE MODELO DE NEGÓCIO / [en] THE USE OF BLOCKCHAIN FOR CONTROLLING THE OIL AND GAS SUPPLY CHAIN: A BUSINESS MODEL PROPOSAL

GUILHERME COPPI DURANTE 26 May 2021 (has links)
[pt] Os problemas relacionados ao controle de qualidade e a fraudes no setor de distribuição de combustíveis são tão antigos quanto o próprio setor. Furto, desvios de qualidade, sonegação fiscal e adulteração de combustíveis são problemas recorrentes e muito prejudiciais para toda a cadeia. Na tentativa de combater estes desvios, as distribuidoras continuamente empenham esforços e recursos financeiros no desenvolvimento de novos procedimentos operacionais e mecanismos de governança. Tais mecanismos de governança visam reduzir o espaço para oportunismo dos envolvidos e aumentar o controle sobre os produtos ao longo da cadeia. Neste contexto, a Blockchain tem se provado uma eficiente tecnologia para a implantação de mecanismos de governança e para o controle de cadeias de suprimentos. Através do uso de contratos inteligentes executados em uma Blockchain privada, este trabalho propõe um modelo de negócio de uma solução tecnológica para o controle da cadeia de suprimentos de combustíveis. Esta solução visa o rastreamento e certificação do volume vendido, desde a distribuidora até o consumidor final, através de pares digitais refletidos na Blockchain. Com isso, pretende-se garantir um controle pleno das distribuidoras sobre a cadeia de suprimentos. / [en] Problems related to quality control and fraud in the fuel distribution sector are as old as the sector itself. Fuel theft, tax evasion and adulteration are recurrent events and very damaging for the entire industry. In an attempt to suppress these deviations, distributors continually commit efforts and financial resources to the development of new operating procedures, new technologies and new governance mechanisms. Such mechanisms aim to reduce the opportunism and to increase control over products throughout the supply chain. In this context, Blockchain has proven to be an efficient technology for the implementation of governance mechanisms and for the control of supply chains. Through the use of smart contracts executed on a private Blockchain, this work proposes a business model of a technological solution for controlling the volumes being transferred through the fuel supply chain. The proposed solution, presented in the form of a business model, aims to track and certify the volume sold, from the distributor to the final costumer through tokenized digital pairs reflected in a Blockchain. With so, it is intended to guarantee full control of the distributors over the supply chain.
42

A Comprehensive Analysis of the Environmental Impact on ROPUFs employed in Hardware Security, and Techniques for Trojan Detection

Alsulami, Faris Nafea January 2022 (has links)
No description available.
43

[en] A BLOCKCHAIN BASED MODEL FOR THE OFFER OF RENEWABLE ENERGY CERTIFICATES UNDER UNCERTAINTY AND FLEXIBILITY / [pt] UM MODELO PARA OFERTA DE CERTIFICADOS DE ENERGIA RENOVÁVEL NA BLOCKCHAIN SOB INCERTEZA E FLEXIBILIDADE

NAIELLY LOPES MARQUES 24 April 2019 (has links)
[pt] A redução da poluição e das emissões de gases de efeito estufa tem sido o foco de um grande esforço global. Nesse contexto, Certificados de Energia Renovável (RECs) são de grande importância para incentivar mudanças na matriz energética, visando à adoção de práticas sustentáveis. Dado o crescimento deste mercado e as características dos RECs, uma das potenciais ferramentas impulsionadoras da sua adoção é o protocolo de rede blockchain. Nesta pesquisa, analisamos três modelos autônomos de emissão e venda na blockchain de tokens baseados em RECs em condições de incerteza para um gerador de energia renovável. Nos três modelos, o gerador tem a opção de investir agora ou daqui a um ano para ter o direito de emitir RECs e ofertá-los através de leilões de venda trimestrais. No primeiro, assumimos que o preço do token é fixo, seguindo o conceito de uma stable coin. No segundo, consideramos que o preço segue uma função inversa da demanda sujeita a choques estocásticos. Finalmente, no terceiro, a demanda por RECs é incerta e busca-se maximizar o lucro do gerador. Realizamos uma aplicação numérica para verificarmos a validade dos modelos e concluímos, considerando os parâmetros adotados, que o gerador deverá investir no segundo modelo, pois foi o que apresentou maior VPL ( 60.992,70 Reais). Contudo, se a volatilidade da demanda for inferior a 20,00 por cento, o modelo ótimo para o gerador é o primeiro modelo. A principal contribuição deste trabalho é analisar a dinâmica do desempenho de produtos digitais sob incerteza. / [en] Reducing pollution and greenhouse gas emissions has been the focus of a major global effort. In this context, Renewable Energy Certificates (RECs) are important as they provide incentives for changes in the energy matrix, towards the adoption of sustainable practices. Given the growth of this market and the characteristics of RECs, one of the potential drivers of their adoption is the blockchain network protocol. In this research, we analyze three autonomous models for issuing and selling in the blockchain of REC based tokens for the renewable energy generator. In all three models, the generator has the option to invest now or in one year for the right to issue RECs and offer them through quarterly sales auctions. In the first model, we assume that the token price is fixed following a stable coin concept. In the second model, we consider that the price follows an inverse demand function subject to stochastic shocks. Finally, in the third model, the demand for RECs is uncertain and the purpose is to maximize the generator s profit. Through a numerical application, we verify the validity of the models and conclude, considering the parameters adopted, that the generator should invest in the second model, since it was the one with the highest NPV (60,992.70 real). However, if the demand volatility is less than 20.00 percent, the optimal model for the generator is the first model. The main contribution of this work is to analyze the performance dynamics of digital products under uncertainty.
44

[en] ON THE USE OF BLOCKCHAIN STRUCTURES IN A MULTIAGENT BASED SOFTWARE ENGINEERING METHOD: A HEALTHCARE EXAMPLE / [pt] UM MÉTODO DE ENGENHARIA DE SOFTWARE PARA O USO DE ESTRUTURAS BLOCKCHAIN EM SISTEMAS MULTIAGENTES: UM EXEMPLO NO DOMÍNO DA SAÚDE

PEDRO AUGUSTO DA SILVA E SOUZA MIRANDA 13 December 2021 (has links)
[pt] Este trabalho apresenta uma proposta de implementação de uma blockchain privada gerenciada por agentes de software para armazenar dados de sáude. A tecnologia blockchain está mudando a maneira com que dados privados são armazenados. Agora é possível compartilhar informações sem revelar quem é o dono da informação. Este trabalho apresenta um sistema que permite que usuários armazenagem dados de saúde em uma blockchain gerenciada por agentes de software. Pesquisas revelaram que dados de saúde devem ser armazenado em blockchains privadas, pois são privadas e não devem ser acessíveis para qualquer pessoa como em blockchains públicas. Técnicas de engenharia de software foram utilizadas para desenvolver a arquitetura proposta. O resultado é uma blockchain privada capaz de manipular dados no padrão HL7 e armazena-los de forma anônima e privada. Agentes de software foram utilizados para realizar todo o processo de recebimento, validação e inserção de dados no blockchain. / [en] This paper presents an implementation approach for a private blockchain that is managed by software agents for healthcare data storage. Blockchain technology is changing the way we store private information. Now, it is possible to share private information while not revealing its owner s identity. This paper presents a solution, which enables users to store medical data by using blockchains along with software agents. Further research work has shown that healthcare data, as sensitive information, should be stored in private blockchains through the use of appropriate methods. Software engineering techniques have been used to achieve the proposed solution. The result is a private blockchain that is suitable for manipulating HL7 data, ensuring anonymity and privacy. This can be achieved through software agents that act as regulatory controls for the private blockchains.
45

[pt] LEDGERS SEGUROS E DISTRIBUÍDOS PARA SUPORTAR DADOS DE TECNOLOGIA IOT / [en] SECURE DISTRIBUTED LEDGERS TO SUPPORT IOT TECHNOLOGIES DATA

ADRIAN CONCEPCION LEON 18 January 2022 (has links)
[pt] Blockchain e Tangle são estruturas de dados usadas para criar um registro público imutável de dados segurados por uma rede de participantes peer-to-peer que mantém um conjunto de registros de dados em constante crescimento conhecidos como ledgers. As tecnologias Blockchain e Tangle são uma solução descentralizada que garante a troca de grandes quantidades de mensagens confiáveis, entre bilhões de dispositivos de IoT conectados, os quais são muito valiosos, desde que sejam válidos e completos. Esse mecanismo de mensagens peer-to-peer altamente criptografado e seguro é adotado neste projeto para gerenciar o processamento de transações de IoT e a coordenação entre os dispositivos que interagem com o processo. Para manter as transações privadas e seguras, os algoritmos de consenso distribuídos são responsáveis por validar e escolher as transações e registrá-las no ledger global. Os resultados mostraram que a velocidade dos algoritmos de consenso pode afetar a criação em tempo real de histórias confiáveis que rastreiam os eventos das redes IoT. Após incorporar o Processamento de Eventos Complexos, que permite selecionar apenas os eventos de alto nível, é possível obter uma melhoria em muitas situações. O resultado é um sistema Middleware que fornece framework para a construção de aplicativos de larga escala onde podem usar Processamento de Eventos Complexos e diferentes ledgers descentralizados, como o blockchain da Ethereum ou IOTA Tangle, para armazenamento seguro de dados. / [en] Blockchain and Tangle are data structures and protocols used to create an immutable public record of data ensured by a network of peer-to-peer participants that maintain a monotonic constantly growing set of data records known as ledgers. Both technologies provide a decentralized solution that guarantees the exchange, among billions of IoT devices, of large amounts of trusted messages, which are very valuable as long as they are valid and complete. This highly encrypted and secure peer-to-peer messaging mechanism is adopted in this project to manage the processing of IoT transactions. To maintain transactions private, and secured consensus algorithms are responsible for validating and choosing transactions and recording them in the global ledger. The results showed that the speed of the consensus algorithms can affect the creation in real-time of reliable stories that track the events of the IoT networks. After incorporating Complex Event Processing that allows selecting only those high-level events, it is possible to obtain an improvement in many situations. The result is a Middleware system that provides a framework for the construction of large-scale computer applications that use Complex Events Processing and different decentralized ledgers such as the blockchain of Ethereum or IOTA Tangle, for secure data storage.
46

[pt] ANÁLISE DE INVESTIMENTOS NA IMPLEMENTAÇÃO DA TECNOLOGIA BLOCKCHAIN EM SERVENTIAS EXTRAJUDICIAIS: UMA ABORDAGEM DE OPÇÕES REAIS / [en] INVESTMENT ANALYSIS FOR IMPLEMENTING BLOCKCHAIN TECHNOLOGY IN NOTARY OFFICES: A REAL OPTIONS APPROACH

MARINA LUDOVICO STOLLENWERK 02 September 2024 (has links)
[pt] O objetivo da dissertação é contribuir para o avanço do conhecimento sobre análise de investimentos com opções reais na implementação da tecnologia blockchain em serventias extrajudiciais, segundo o ordenamento jurídico brasileiro. Para tal, desenvolveu-se um modelo teórico baseado na Teoria das Opções Reais (TOR) para analisar investimentos na tecnologia blockchain, considerando diferentes níveis de adoção dessas tecnologias em serviços notariais e registrais e tipos de opções reais. A metodologia adotada compreende: (i) pesquisa bibliográfica e documental sobre o tema central da dissertação; (ii) análise de conteúdo para mapear as espécies de serventias extrajudiciais existentes no ordenamento jurídico brasileiro, associando-as aos níveis de adoção da tecnologia blockchain reportados na literatura; (iii) desenvolvimento do modelo teórico para análise de investimentos com opções reais na implementação da tecnologia blockchain no referido contexto; (iv) demonstração da aplicabilidade do modelo proposto, a partir de dados primários coletados em uma serventia extrajudicial localizada no Estado do Paraná; e (v) análise reflexiva sobre os potenciais benefícios econômicos e não econômicos da adoção da tecnologia blockchain nas operações de serviços notariais e registrais no Brasil. Destacam-se como resultados principais um modelo de análise de investimentos com opções reais na implementação da tecnologia blockchain em serviços notariais e registrais no Brasil e a avaliação de seus impactos econômicos e não econômicos para os oficiais titulares, usuários dos serviços e a sociedade em geral. / [en] This dissertation aims to contribute to the advancement of knowledge on the analysis of investments with real options in the implementation of blockchain technology in notary offices under the Brazilian legal framework. To achieve this, a theoretical model was developed based on the Real Options Theory (ROT) to analyze investments in blockchain technology, considering varying levels of adoption of this technology in notarial and registry services, as well as types of real options. The adopted methodology encompasses: (i) bibliographic and documentary research on the central themes of the dissertation; (ii) content analysis to map the types of notarial and registry offices existing in the Brazilian legal framework, associating them with the reported levels of adoption of blockchain technology reported in the literature; (iii) development of a theoretical model for the analysis of investments with real options in the aforementioned context; (iv) of the applicability of the proposed model, based on primary data collected from an extrajudicial office located in the state of Paraná; and (v) reflective analysis of the potential economic and non-economic benefits of adopting blockchain technology in notarial and registry services in Brazil. The main results include a model for the analysis of investments with real options in the implementation of blockchain technology in notarial and registry services in Brazil, along with an assessment of its economic and noneconomic impacts on titular officials, service users, and society in general.
47

Exploring the Use of Blockchain Technology to Address Cybersecurity Risks in Banking and Finance / Utforskning av användning av blockkedjeteknik för att hantera cybersäkerhetsrisker inom bank och finans

Din, Eman January 2023 (has links)
The growing reliance on digital services has led to an escalation in cyber risks and attacks targeting banks and financial institutions. Such cyber threats necessitate innovative solutions. But to achieve it, one needs to overcome the challenges of seeking reliable information on utilizing blockchain technology to combat cyber-attacks. Hence, this work aims to use a systematic literature review to study the potential of blockchain technology to mitigate cyber threats in the banking and financial sector as well as the advantages and challenges of blockchain technology. Blockchain provides heightened security, improv transaction processes, ensures transparency and privacy, optimizes operational performance, and reduces fraud. Despite its advantages, challenges like regulatory compliance, privacy concerns, and scalability need careful consideration. Prominent institutions like Bank of America, HSBC, and J.P. Morgan are actively investigating blockchain integration. To ensure wise choices regarding blockchain use in organizations with valuable data and assets, advisors and business leaders must fully grasp both the advantages and possible drawbacks of this technology. Armed with this information, financial institutions gain essential insights, steering them towards judicious choices concerning the integration and utilization of blockchain technology, thereby enhancing, and reinforcing their cybersecurity framework. / Den ökande användningen av digitala tjänster har resulterat i en ökning av cyberrisker och attacker riktade mot banker och finansinstitutioner. Cyberhot fortsätter att utmana säkerheten för finansiella institutioner, vilket kräver nyskapande lösningar. För att uppnå det måste man övervinna utmaningarna med att söka tillförlitlig information angående användningen av blockkedja teknik för att bekämpa cyberattacker. Därför syftar detta verk till att använda systematisk litteraturgenomgång för att utforska potentialen hos blockkedjeteknik för att mildra cyberhot inom bank- och finanssektorn, samt för- och nackdelar med teknologin. Blockkedja teknik erbjuder förhöjd säkerhet, optimerar transaktionsprocessen, säkerställer transparens och integritet, ökar operativ prestanda och minskar risken för bedrägeri. Trots dessa fördelar måste utmaningar som regeluppfyllelse, integritetsfrågor och skalbarhet hanteras med omsorg. Framstående institutioner som Bank of America, HSBC och J.P. Morgan undersöker aktivt integration av blockkedja teknik. För att säkerställa kloka beslut kring blockkedjeanvändning i organisationer med viktig information och tillgångar är det avgörande att rådgivare och företagsledare har en djup förståelse för både fördelar och möjliga nackdelar med teknologin. Med denna insikt i ryggen får finansinstitutioner värdefull vägledning när det gäller integration och användning av blockkedjeteknik, vilket stärker och förbättrar deras ramverk för cybersäkerhet.
48

Guardians of the Grid: Enhancing Cybersecurity of Blockchain-Based Renewable Energy Marketplace

JAYARAM, GILY January 2024 (has links)
Blockchain technology emerged as a potent tool for revolutionizing energy systems, offering secure transactions and efficient resource management. Blockchain offers transparency by enabling decentralized transactions. Despite adopting blockchainbased solutions, some cybersecurity issues persist in Decentralized Renewable Energy Marketplaces (DREMs). Specifically, data privacy, security, and verifiability remain a concern for prosumers and grid operators. To address such issues, several blockchainbased solutions utilize technologies such as Self-Sovereign Identities (SSIs), Digital Machine Identities (DMIs), and Zero-knowledge Proofs (ZKPs). In this work, we first review the literature to gain insight into cybersecurity issues within DREMs addressed using blockchain technology. Based on our review, we conceptualize a framework that leverages SSIs, DMIs, and ZKPs to address these issues. This work-in-progress shows the potential of these technologies to enhance security, privacy, and trust in decentralized energy transactions, paving the way for more resilient and efficient energy systems.
49

Measuring Tokenomics / Statistical Modeling and Analysis

Lin, Min-Bin 01 June 2023 (has links)
Die Blockchain-Technologie revolutioniert die Interaktion zwischen Menschen durch Peer-to-Peer-Netzwerke, Kryptografie und Konsensalgorithmen. Trustless Trust ermöglicht sichere und transparente Transaktionen ohne Zwischenhändler. Trotz der zunehmenden Beliebtheit von Krypto-Assets und den damit verbundenen „Tokenomics“ hat die Öffentlichkeit immer noch kein umfangreiches Wissen über die Funktionsweisen dieser Technologie, und ein Großteil des Diskurses bleibt spekulativ. Das Hauptziel dieser Arbeit ist, die grundlegenden Prinzipien von Krytowährungen (Cryptos) und Non-Fungible Tokens (NFTs) zu untersuchen sowie eine Korrelation zwischen der Technologie und ihren Auswirkungen auf die Wirtschaft aus statistischer und wirtschaftlicher Sicht herzustellen. Um dieses Ziel zu erreichen, wird in den Kapiteln 2 und 3 der Einfluss der Blockchain-Technologie auf Ökonomie und Funktionsweise von Kryptowährungen anhand ökonometrischer Modelle und Clustering-Techniken untersucht. Kapitel 3 untersucht Kryptowirschaft und Blockchain-Funktionalität anhand empirischer Methoden, insbesondere für Coincreatoren und Investoren. Wir zeigen am Beispiel von Ethereum, dass die wirtschaftliche Leistung von Kryptowährungen durch die Gestaltung der ihnen zugrunde liegenden Blockchain-Technologie beeinflusst werden kann. Kapitel 4 untersucht die partiellen Korrelationen von Bitcoin-Renditen über neun verschiedene Zentralbörsen aus der Perspektive eines hochfrequenten, dynamischen Netzwerks. Die vorgeschlagene MHAR-CM liefert Kovarianzschätzungen, die die Besonderheiten der Kryptomärkte berücksichtigen. Das Kapitel zeigt Spillover- und Third-Party-Risiken zwischen diesen Börsen. Kapitel 5 verwendet eine Hedonische Bewertungsmethode, um den DAI Digital Art Index basierend auf dem NFT-Kunstmarkt zu konstruieren. Ein besonderer Fokus liegt auf der Nivellierung der Auswirkungen von Ausreißern mit einer einstufigen robusten Regressions-Huberisierung und einem dynamic conditional score model. Diese Arbeit verknüpft neue Technologien und Wirtschaft durch statistische Modellierung und Analyse. Durch die Bereitstellung empirischer Belege beobachten wir, wie die Blockchain-Technologie unsere Wahrnehmung von Geld, Kunst und anderen Branchen verändert. / The emergence of distributed ledger technologies, such as blockchain, has revolutionized how individuals interact by enabling "trust-less trust" through peer-to-peer networks, cryptography, and consensus algorithms. This technology eliminates intermediaries and provides secure, transparent transaction methods. However, public understanding of this technology, along with "Tokenomics", remains limited, resulting in speculative discourse. The main objective of this thesis is to investigate the fundamental principles of cryptocurrencies (cryptos) and non-fungible tokens (NFTs) and establish a correlation between the technology and its economic impact from statistical and economic perspectives. To achieve this, Chapters 2 and 3 explore the influence of blockchain technology on the economic and functional performance of cryptos using econometric models and clustering techniques. Chapter 3 presents an empirical framework that offers insights to coin creators and investors regarding the interplay between cryptonomics, blockchain functionality, and market dynamics. The economic performance of cryptocurrencies, illustrated with Ethereum as an example, is shown to be affected by the design of their underlying blockchain technology. Chapter 4 examines partial correlations of Bitcoin returns across nine centralized exchanges from a high-frequency dynamic network perspective. The proposed MHAR-CM provides reasonable covariance estimates that account for the unique characteristics of crypto markets. This chapter uncovers spillover risk and counterparty risk among these exchanges. In Chapter 5, a hedonic regression approach is employed to construct the DAI digital art index for the NFT art market. Special emphasis is given to mitigating the impact of outliers using one-step robust regression Huberization and a dynamic conditional score model. The DAI index enhances our understanding of this emerging art market and facilitates observation of its macroeconomic trends. This thesis establishes a connection between emerging technologies and the economy through statistical modeling and analysis. By providing empirical evidence, we gain insights into how blockchain technology is transforming our perceptions of money, art, and various industries.
50

[pt] DOAÇÃO DE NFTS À LUZ DO PLANEJAMENTO SUCESSÓRIO / [en] DONATING NFTS IN LIGHT OF SUCESSION PLANNING

GABRIEL ARAUJO VILLARINHO 20 March 2025 (has links)
[pt] Os tokens não fungíveis (NFTs) são ativos digitais únicos e exclusivos, que têm potencial para diversas utilidades que vão muito além do uso para o qual esses bens são associados. No entanto, a legislação atual não reconhece a transferência desses bens após a morte do proprietário. Portanto, a dissertação busca analisar o planejamento sucessório desses bens e a possibilidade de usar o contrato de doação como forma de planejamento desse bem digital. / [en] Non-fungible tokens (NFTs) are unique and exclusive digital assets, which have the potencial for various utilities that go far beyond the for which these goods are associated. However, current legislation does not recognize the transfer of these assets after the death of the owner. Therefore, the dissertation seeks to analyze the sucession planning of these assets and the possibility of using the donation contract as a way of planning the succession of this digital asset.

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