Rui Oliveira
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View article: Chemical characterization and antioxidant potential of Arthrospira sp., Thalassiosira sp., and Raphidonema sp.
Chemical characterization and antioxidant potential of Arthrospira sp., Thalassiosira sp., and Raphidonema sp. Open
Microalgae are emerging as valuable sources of bioactive compounds. This study evaluates hexane extracts from Thalassiosira sp. and Raphidonema sp., and Arthrospira sp., for their bioactive potential. Saturated fatty acids predominated in …
View article: Diagnosing applications' I/O behavior through system call observability
Diagnosing applications' I/O behavior through system call observability Open
We present DIO, a generic tool for observing inefficient and erroneous I/O interactions between applications and in-kernel storage systems that lead to performance, dependability, and correctness issues. DIO facilitates the analysis and en…
View article: Interaction and Decision Making-aware Motion Planning using Branch Model Predictive Control
Interaction and Decision Making-aware Motion Planning using Branch Model Predictive Control Open
Motion planning for autonomous vehicles sharing the road with human drivers remains challenging. The difficulty arises from three challenging aspects: human drivers are 1) multi-modal, 2) interacting with the autonomous vehicle, and 3) act…
View article: Toward a Practical and Timely Diagnosis of Application’s I/O Behavior
Toward a Practical and Timely Diagnosis of Application’s I/O Behavior Open
We present DIO, a generic tool for observing inefficient and erroneous I/O interactions between applications and in-kernel storage backends that lead to performance, dependability, and correctness issues. DIO eases the analysis and enables…
View article: Deploying decentralized, privacy-preserving proximity tracing
Deploying decentralized, privacy-preserving proximity tracing Open
Lessons from a pandemic.
View article: Toward a Common Performance and Effectiveness Terminology for Digital Proximity Tracing Applications
Toward a Common Performance and Effectiveness Terminology for Digital Proximity Tracing Applications Open
Digital proximity tracing (DPT) for Sars-CoV-2 pandemic mitigation is a complex intervention with the primary goal to notify app users about possible risk exposures to infected persons. DPT not only relies on the technical functioning of t…
View article: Towards a common performance and effectiveness terminology for digital proximity tracing applications
Towards a common performance and effectiveness terminology for digital proximity tracing applications Open
Digital proximity tracing (DPT) for Sars-CoV-2 pandemic mitigation is a complex intervention with the primary goal to notify app users about possible risk exposures to infected persons. Policymakers and DPT operators need to know whether t…
View article: Decentralized Privacy-Preserving Proximity Tracing
Decentralized Privacy-Preserving Proximity Tracing Open
This document describes and analyzes a system for secure and privacy-preserving proximity tracing at large scale.This system provides a technological foundation to help slow the spread of SARS-CoV-2 by simplifying and accelerating the proc…
View article: On the Use of a Reflective Architecture to Augment Database Management Systems
On the Use of a Reflective Architecture to Augment Database Management Systems Open
The Database Management System (DBMS) used to be a commodity software component, with well known standard interfaces and semantics. However, the performance and reliability expectations being placed on DBMSs have increased the demand for a…
View article: A Multi-Technology Communication Platform for Urban Mobile Sensing
A Multi-Technology Communication Platform for Urban Mobile Sensing Open
A common concern in smart cities is the focus on sensing procedures to provide city-wide information to city managers and citizens. To meet the growing demands of smart cities, the network must provide the ability to handle a large number …
View article: SAFETHINGS: Data Security by Design in the IoT
SAFETHINGS: Data Security by Design in the IoT Open
Despite years of research and the long-lasting promise of pervasiveness of an "Internet of Things", it is only recently that a truly convincing number of connected things have been deployed in the wild. New services are now being built on …
View article: A Practical Framework for Privacy-Preserving NoSQL Databases
A Practical Framework for Privacy-Preserving NoSQL Databases Open
Cloud infrastructures provide database services as cost-efficient and scalable solutions for storing and processing large amounts of data. To maximize performance, these services require users to trust sensitive information to the cloud pr…
View article: SafeFS: a modular architecture for secure user-space file systems
SafeFS: a modular architecture for secure user-space file systems Open
The exponential growth of data produced, the ever faster and ubiquitous connectivity, and the collaborative processing tools lead to a clear shift of data stores from local servers to the cloud. This migration occurring across different ap…
View article: HTAPBench
HTAPBench Open
The increasing demand for real-time analytics requires the fusion of Transactional (OLTP) and Analytical (OLAP) systems, eschewing ETL processes and introducing a plethora of proposals for the so-called Hybrid Analytical and Trans-actional…
View article: Performance trade-offs on a secure multi-party relational database
Performance trade-offs on a secure multi-party relational database Open
The privacy of information is an increasing concern of software applications users. This concern was caused by attacks to cloud services over the last few years, that have leaked confidential information such as passwords, emails and even …
View article: Prepared scan
Prepared scan Open
The ability of NoSQL systems to scale better than traditional relational databases motivates a large set of applications to migrate their data to NoSQL systems, even without aiming to exploit the provided schema exibility. However, accessi…
View article: BuzzPSS: A Dependable and Adaptive Peer Sampling Service
BuzzPSS: A Dependable and Adaptive Peer Sampling Service Open
A distributed system is often built on top of an overlay network. Overlay networks enable network topology transparency while, at the same time, can be designed to provide efficient data dissemination, load balancing, and even fault tolera…
View article: On the Cost of Safe Storage for Public Clouds: An Experimental Evaluation
On the Cost of Safe Storage for Public Clouds: An Experimental Evaluation Open
Cloud-based storage services such as Dropbox, Google Drive and OneDrive are increasingly popular for storing enterprise data, and they have already become the de facto choice for cloud-based backup of hundreds of millions of regular users.…
View article: Towards Performance Prediction in Massive Scale Datastores
Towards Performance Prediction in Massive Scale Datastores Open
Buffer caching mechanisms are paramount to improve the performance of today's massive scale NoSQL databases. In this work, we show that in fact there is a direct and univocal relationship between the resource usage and the cache hit ratio …