Ernani Azevedo

Instituto SENAI de Inovação · Tecnologias da Informação e Comunicação

Este artigo descreve o projeto SmartWEG (Smart Water, Energy & Gas), cujo objetivo é propor uma forma simples e inteligente de monitorar e receber notificações de vazamentos e variações no padrão de consumo.

Security is a well-known critical issue and exploitation of vulnerabilities is increasing in number, sophistication and damage. Furthermore, legacy systems tend to offer difficulty when upgrades are needed, specially when security recommendations are proposed. This paper presents a strategy for legacy systems based on three disciplines which guide...

Several works study the performance of Content Delivery Networks (CDNs) under various network infrastructure and demand conditions. Some go even further while considering demand elasticity by leveraging on Cloud elasticity where each Content Service Provider (CSP) is served only the amount of storage space and network throughput that it needs and p...

Content Delivery Networks have gained a popular role among application service providers (ASPs) and infrastructural companies. A CDN is an overlay network that gives more control of asset delivery by strategically placing servers closer to the enduser, reducing response time and network congestion. Many strategies have been proposed to deal with as...

The manual creation of new Internet- and IT-based applications is currently a limiting factor in enabling new and innovative services to be quickly available. We advocate that semi-automated service creation techniques are feasible, whereas fully automated ones are not a reality yet. Consistently increasing the level of automation may lead to a bet...

The Internet has rapidly evolved, becoming a virtual place where it is simple to handle tasks that were known to be cumbersome or complex beforehand. However the development of new services remains a time consuming activity. This paper presents E2ECloud, a computing environment that allows the development of solutions for creation and provision of...

Dynamic system adaptation to continuously changing business requirements and environment conditions has been a common demand for IT over the last years. In spite of constant innovation in service computing, current technology is not able to keep up with business ever growing need faster time to market. The Service Refinement Cycle (SRC) has been pr...

In this paper we present a new architecture for the Cloud Integrator platform that extends it in two directions. The first one aimed at improving the way of an application can be defined by a developer. Instead of dealing with the burden of defining applications only by specifying semantic workflows in terms of activities expressed as a tuple <;tas...

Content Distribution Networks (CDN) are a popular technology used to deliver content and have attracted great interest in recent years. CDNs place content replicas closer to end users by geographically distributing replica servers. One important research point concerning the CDN universe concerns decisions about where replica servers should be plac...

There is a significant lack of integrated Content Delivery Network (CDN) planning tools. P2PCDNSim, a comprehensive CDN simulator, is presented in this work. The result of a three-year project, it allows performance analysis of a wide range of CDN scenarios. The simulator performs similarly to the ns-3 and CDNsim public simulators at the packet and...

Streaming media usage on the Web has recently increased by over 100% a year, and Video-on-Demand applications represent 40% of the Internet traffic. To improve the quality of streaming media delivery, a proxy server using cache strategies placed closer to end users is one of the main solutions used by service providers. The problem faced by cache m...

Content Distribution Networks (CDN) are a popular technology to deliver content and have attracted great interest in recent years. Replica Placement Algorithms (RPA) are one of the main widely studied CDN strategies. In this paper we propose a new dynamic RPA strategy, very similar to the Greedy strategy, based on the count of data flows through ne...

Cloud computing provides on-demand allocation and deallocation of resources via the key feature of elasticity. Although there are many choices of public and private clouds, detailed performance analysis for elasticity operations in such environments are not available. This paper compares the performance of core elasticity operations for the Amazon...

Composition and virtualization are related concepts in scenarios where different entities collaborate for achieving a common goal. Such concepts have been presented in the literature as unrelated to each other. The reason might be the lack of both a unifying axis and a strong motivation. This paper presents an integrated model with concepts and tec...

Service composition is an important feature enabled by Service Oriented Computing but it remains mainly a manual process. Proposals for complete or partial automation of composition exist, the majority relying on artificial intelligence-based planning, automated proof techniques, or graph-based solutions. Although sound, these approaches present pr...

Policies have the potential of playing a key role in Service Oriented Computing (SOC) providing many useful features for service creation, execution and management. However, so far the Policy-Based Management area has had a limited adoption and the result is that its advocated benefits still remain unproven in a broader sense. In this paper we show...