Analyzing Peer Selection Policies for BitTorrent Multimedia On-Demand Streaming Systems in Internet

The adaptation of the BitTorrent protocol to multimedia on-demand streaming systems essentially lies on the modification of its two core algorithms, namely the piece and the peer selection policies, respectively. Much more attention has though been given to the piece selection policy. Within this context, this article proposes three novel peer selection policies for the design of BitTorrent-like protocols targeted at that type of systems: Select Balanced Neighbour Policy (SBNP), Select Regular Neighbour Policy (SRNP), and Select Optimistic Neighbour Policy (SONP). These proposals are validated through a competitive analysis based on simulations which encompass a variety of multimedia scenarios, defined in function of important characterization parameters such as content type, content size, and client interactivity profile. Service time, number of clients served and efficiency retrieving coefficient are the performance metrics assessed in the analysis. The final results mainly show that the novel proposals constitute scalable solutions that may be considered for real project designs. Lastly, future work is included in the conclusion of this paper.Comment: 19 PAGE

Comparative Analysis of Blockchain-Based Platforms for Managing Electronic Health Records in the Public Healthcare System of Brazil

This article comparatively analyzes two platforms based on Blockchain, aiming at the management of electronic health records in the public healthcare system of Brazil. The difference between the platforms primarily lies in the deployed consensus algorithm. Efficiency, availability, integrity, and confidentiality requirements are evaluated through analytical models and theoretical discussions. Among the obtained results, we highlight the following: (i) the platform with a voting-based consensus algorithm yields a more efficient system, but is more prone to service unavailability, than that of the platform deploying an intensive-compute consensus algorithm; (ii) integrity and confidentiality requirements may be satisfactorily met regardless of the consensus type. As the main contribution, this article provides valuable experimental results and theoretical subsidies, which together complement previous research and help to lay the groundwork for the fruitful development of real projects. Finally, conclusions and future work conclude this article

On the Optimization of BitTorrent-Like Protocols for Interactive On-Demand Streaming Systems

This paper proposes two novel optimized BitTorrent-like protocols for interactive multimedia streaming: the Simple Interactive Streaming Protocol (SISP) and the Exclusive Interactive Streaming Protocol (EISP). The former chiefly seeks a trade-off between playback continuity and data diversity, while the latter is mostly focused on playback continuity. To assure a thorough and up-to-date approach, related work is carefully examined and important open issues, concerning the design of BitTorrent-like algorithms, are analyzed as well. Through simulations, in a variety of near-real file replication scenarios, the novel protocols are evaluated using distinct performance metrics. Among the major findings, the final results show that the two novel proposals are efficient and, besides, focusing on playback continuity ends up being the best design concept to achieve high quality of service. Lastly, avenues for further research are included at the end of this paper as well.Comment: 20 page

Improving BitTorrent's Peer Selection For Multimedia Content On-Demand Delivery

The great efficiency achieved by the BitTorrent protocol for the distribution of large amounts of data inspired its adoption to provide multimedia content on-demand delivery over the Internet. As it is not designed for this purpose, some adjustments have been proposed in order to meet the related QoS requirements like low startup delay and smooth playback continuity. Accordingly, this paper introduces a BitTorrent-like proposal named as Quota-Based Peer Selection (QBPS). This proposal is mainly based on the adaptation of the original peer-selection policy of the BitTorrent protocol. Its validation is achieved by means of simulations and competitive analysis. The final results show that QBPS outperforms other recent proposals of the literature. For instance, it achieves a throughput optimization of up to 48.0% in low-provision capacity scenarios where users are very interactive.Comment: International Journal of Computer Networks & Communications(IJCNC) Vol.7, No.6, November 201

BLOCKCHAIN-BASED PLATFORM FOR MANAGING PATIENTS’ DATA IN THE PUBLIC HEALTHCARE SYSTEM OF BRAZIL

The public healthcare system of Brazil must serve a populationof around 214 million citizens, spread across 27 federativeunits covering a territory of over 8.5 million km2. Oneof the pivotal bottlenecks for its effective operation lies in themanagement of patients’ health data, which are consolidatedin medical records. Intrinsically distributed and decentralized,the aforementioned data management raises deep concernsregarding efficiency, security, and scalability, besideseconomic cost. In this context, the Blockchain technologyhas been envisioned as a promising solution. This articletherefore proposes a Blockchain-based platform for managingmedical records. Its effectiveness is herein attested byconceptual discussion plus analytical modeling. As the maincontribution, we thus provide the literature with theoreticalsubsidies and experiments that may underpin and guide thedevelopment of real projects. At last, conclusions and futureworks close this article.The public healthcare system of Brazil must serve a populationof around 214 million citizens, spread across 27 federativeunits covering a territory of over 8.5 million km2. Oneof the pivotal bottlenecks for its effective operation lies in themanagement of patients’ health data, which are consolidatedin medical records. Intrinsically distributed and decentralized,the aforementioned data management raises deep concernsregarding efficiency, security, and scalability, besideseconomic cost. In this context, the Blockchain technologyhas been envisioned as a promising solution. This articletherefore proposes a Blockchain-based platform for managingmedical records. Its effectiveness is herein attested byconceptual discussion plus analytical modeling. As the maincontribution, we thus provide the literature with theoreticalsubsidies and experiments that may underpin and guide thedevelopment of real projects. At last, conclusions and futureworks close this article.DOI: 10.36558/rsc.v11i3.754

Sistema Bitcoin: uma análise da segurança das transações

Este artigo concentra-se principalmente na análise do nível de segurança associado às transações do sistema Bitcoin. Para isso, é inicialmente apresentada uma explicação detalhada de cada atividade que integra a execução de uma transação no sistema. Em seguida, através de modelagem matemática, são realizados experimentos para avaliar o nível de segurança de uma transação. Os resultados finais permitem conjecturar sobre a significativa robustez tecnológica do sistema Bitcoin. Por último, sugestões para futuras pesquisas, dentro deste tema de pesquisa, estão incluídas no final deste documento

UMA ANÁLISE SIMPLES DE EFICIÊNCIA E SEGURANÇA DA TECNOLOGIA BLOCKCHAIN

Este artigo tem como objetivo realizar uma análise simples da eficiência e da segurança da tecnologia Blockchain. Para este fim, um estudo teórico das estruturas de dados e algoritmos utilizados para armazenar informações é inicialmente realizado, buscando determinar as complexidades de tempo e espaço para a execução das operações de busca. Em seguida, através de modelagem analítica e simulação, diferentes cenários são examinados para avaliar o nível de segurança em termos de inviolabilidade da informação. Em particular, os resultados finais mostram que as operações de pesquisa têm custo logarítmico em função do número de transações dentro de cada bloco de dados e que a segurança do sistema depende principalmente do tempo de registro da informação. Neste contexto, a principal contribuição deste artigo é, portanto, prover a literatura com evidências de quão eficiente e segura é a tecnologia Blockchain. Por fim, conclusões gerais e trabalhos futuros encerram este artigo

Sistema Bitcoin: uma análise da segurança das transações

Este artigo concentra-se principalmente na análise do nível de segurança associado às transações do sistema Bitcoin. Para isso, é inicialmente apresentada uma explicação detalhada de cada atividade que integra a execução de uma transação no sistema. Em seguida, através de modelagem matemática, são realizados experimentos para avaliar o nível de segurança de uma transação. Os resultados finais permitem conjecturar sobre a significativa robustez tecnológica do sistema Bitcoin. Por último, sugestões para futuras pesquisas, dentro deste tema de pesquisa, estão incluídas no final deste documento.This paper is mainly focused on analysing the level of security associated to Bitcoin system transactions. To this end, a detailed explanation of each activity taking part of the execution of a system transaction is firstly presented. Then, through mathematical modeling, experiments to assess the level of security of a system transaction are performed. The final results allow us to conjecture about the technological strength of the Bitcoin system. Lastly, avenues for further research are included at the end of this paper as well

A simple analysis of efficiency and security of the Blockchain Technology

Este artigo tem como objetivo realizar uma análise simples da eficiência e da segurança da tecnologia Blockchain. Para este fim, um estudo teórico das estruturas de dados e algoritmos utilizados para armazenar informações é inicialmente realizado, buscando determinar as complexidades de tempo e espaço para a execução das operações de busca. Em seguida, através de modelagem analítica e simulação, diferentes cenários são examinados para avaliar o nível de segurança em termos de inviolabilidade da informação. Em particular, os resultados finais mostram que as operações de pesquisa têm custo logarítmico em função do número de transações dentro de cada bloco de dados e que a segurança do sistema depende principalmente do tempo de registro da informação. Neste contexto, a principal contribuição deste artigo é, portanto, prover a literatura com evidências de quão eficiente e segura é a tecnologia Blockchain. Por fim, conclusões gerais e trabalhos futuros encerram este artigo.https://www.researchgate.net/publication/321883209_A_Simple_Analysis_of_Efficiency_and_Security_of_the_Blockchain_Technolog

On the optimization of bittorrent-like protocols for interactive on-demand streaming systems

This paper proposes two novel optimized BitTorrent-like protocols for interactive multimedia streaming: the Simple Interactive Streaming Protocol (SISP) and the Exclusive Interactive Streaming Protocol (EISP). The former chiefly seeks a trade-off between playback continuity and data diversity, while the latter is mostly focused on playback continuity. To assure a thorough and up-to-date approach, related work is carefully examined and important open issues, concerning the design of BitTorrent-like algorithms, are analyzed as well. Through simulations, in a variety of near-real file replication scenarios, the novel protocols are evaluated using distinct performance metrics. Among the major findings, the final results show that the two novel proposals are efficient and, besides, focusing on playback continuity ends up being the best design concept to achieve high quality of service. Lastly, avenues for further research are included at the end of this paper as well