Category Archives: Smalltalk

NEXT DI-SMALLTALKS SLOTS — 2015

DI-Smalltalks are currently on hold … after about 2^6 presentations. We might return in 2016! Meanwhile, feel free to let us know if you would like to give a presentation.

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Trusted Distributed Processing Over a Large State

When: Thursday, 2015-June-25, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Bruno Vavala Abstract: Trusted Computing is about guaranteeing the integrity of a remote service based on a small piece of secure hardware. Despite several solutions have been proposed, they either focus … Continue reading

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Brokered ID — a killer app for S2PC?

When: Tuesday, 2015-May-19, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Luís Brandão Abstract: Secure two-party computation allows two parties to compute functions of their combined inputs, while retaining privacy of the inputs. Progress in recent years has improved up to a … Continue reading

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On the Performance of Byzantine Fault-Tolerant MapReduce

When: Wednesday, 2015-May-06, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Pedro Costa Abstract: MapReduce is often used for critical data processing, e.g., in the context of scientific or financial simulation. However, there is evidence in the literature that there are arbitrary … Continue reading

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Computational challenges in Gene Expression studies

When: Thursday, 2015-Apr-02, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Margarida Gama-Carvalho Abstract: Since Francis Crick introduced his pioneer concepts in the 50’s that molecular biologists like myself have been striving in the lab to unravel the principles and mechanisms underlying … Continue reading

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A Lotaria da Avaliação Docente DI-FCUL

When: Thursday, 2015-Feb-19, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Pedro Veiga Abstract: Tendo tido responsabilidades na avaliação docente que decorreu em 2013 e aproximando-se novo ciclo (se bem que com nova legislação e regulamentação) tentarei partilhar alguma da experiência que … Continue reading

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Raft Consensus

When: Thursday, 2015-Feb-12, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Pedro Costa Abstract: Raft is a consensus algorithm that is designed to be easy to understand. It’s equivalent to Paxos in fault-tolerance and performance. The difference is that it’s decomposed into … Continue reading

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Exploring declarative and operational models for communication-centered programming

When: Thursday, 2015-Jan-22, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Hugo A. López Abstract: Communication-Centred (CC) programming has as a focus the descriptions of reliable communication protocols for distributed systems. Interestingly, there has been two main visions when specifying CC programs: … Continue reading

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Agent-Based Modelling and Simulation Systems (ABMS): Research Opportunities for Pest Control and Marine Resource Management in Azores

When: Thursday, 2015-Jan-15, 11h30-12h00 Where: FCUL-DI, room C6.3.05 Presenter: José Cascalho Abstract: In this talk I will present two research contexts for Agent-Based Modeling and Simulation to study complex human and natural systems (CHANS). The contexts are the Pest Control … Continue reading

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Understanding the Accessibility barriers of the Blind when interacting with TV

When: Wednesday, 2014-Dec-17, 11h30-12h00 Where: FCUL-DI, room C6.3.05 Presenter: Daniel Costa Abstract: Connected TV is an advanced broadcasting technology that provides a better experience in terms of picture and sound quality and enables interactive capabilities, while extending the reach of … Continue reading

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On-Body Interaction for Optimized Accessibility

When: Wednesday, 2014-Dec-10, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: David Costa Abstract: In this Smalltalk I will present you the motivation and goals of my thesis, the current work and a brief brainstorm session. My thesis addresses the suitability of … Continue reading

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Detection of web application vulnerabilities using sequence models

When: Thursday, 2014-Dec-04, 11h30-12h00 Where: FCUL-DI, room C6.3.05 Presenter: Ibéria Medeiros Abstract: In this smalltalk, I will present a new static analysis method to detect web application vulnerabilities, as well the DEKANT mechanism that implements that method. Inspired in natural … Continue reading

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A review of some of the features introduced in Java SE 7

When: Thursday, 2014-Nov-27, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Ricardo Fonseca Abstract: In this Smalltalk I will talk about some of the features introduced in Java SE 7. Although version 7 was introduced in the year 2011, some of its … Continue reading

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Diego Kreutz — Towards Secure and Dependable Authentication and Authorization Infrastructures

When: Thursday, 2014-Nov-13, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Diego Kreutz Abstract: We propose a resilience architecture for improving the security and dependability of authentication and authorization infrastructures, in particular the ones based on RADIUS and OpenID. This architecture employs … Continue reading

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Slack and Git are your best friends

When: Wednesday, 2014-Oct-29, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Carlos Mão de Ferro Abstract: If you are not a solitaire cowboy while coding your masterpieces than you got to know two important tools: Git and Slack. Come to the next … Continue reading

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Data structures for big data — Bloom filter

When: Thursday, 2014-Oct-16, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Vinicius Cogo Abstract: In this smalltalk, the presenter will describe the Bloom filter (BF) data structure, as well as present known use cases in big data and some existent implementations. BFs … Continue reading

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Atração de novos alunos para a LEI e LTI

When: Thursday, 2014-Oct-09, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Luís Correia Abstract: Discussão de iniciativas em curso e outras possibilidades para melhorar a captação de novos alunos nas licenciaturas em informática da FCUL.

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Can we model Risk Perception?

When: Thursday, 2014-Sep-25, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Nuno Magessi Abstract: In this smalltalk I’ll explain the importance of modelling risk perception by using agent based model methodology. In what concerns risk, perception is a critical step that occurs … Continue reading

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Distributed Deadlock Detection for Barrier Synchronisation

When: Wednesday, 2014-Sep-17, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Tiago Cogumbreiro Abstract: A major part of deadlock detection is the maintenance of the concurrency constraints between tasks and blocking operations (e.g., barriers). Since barriers are collective operations, their analysis requires … Continue reading

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SMALL-ABSTRACTS

As the DI-Smalltalks series restarts in this 1st semester of 2014/2015, we introduce a new recommendation for “abstracts” (a.k.a. “small-abstracts”), as a further step to promote the “smalltalks” concept (concise, informal, interactive, …). The following items, taken from https://smalltalks.di.fc.ul.pt/about, are … Continue reading

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Online Autonomous Learning Agents

When: Wednesday, 2014-Jul-16, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Davide Nunes Abstract: Evolutionary Computation has been successfully used to synthesise controllers for embodied agents and multiagent systems in general. Notwithstanding this, continuous on-line adaptation by the means of evolutionary algorithms … Continue reading

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Low Level Error Detection For Real-Time Wireless Communications

When: Wednesday, 2014-Jul-09, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Jeferson Souza Abstract: The use of wireless networks to support communications with real-time restrictions is becoming a common requirement within environments such as industries, autonomous vehicles, and aerospace technologies, including also … Continue reading

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IoT aware business processes

When: Thursday, 2014-Jul-03, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Pedro Ferreira (from I. P. Leiria) Abstract: The Internet of Things (IoT) is a buzzword that has emerged in the last decade. The concept indicates that real world objects attached to … Continue reading

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How to reduce the vulnerable window impact?

When: Wednesday, 2014-Jun-04, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Miguel Garcia Abstract: In this smalltalk I will explain how can we improve a service’s resilience by combining diversity and replication techniques. It is realistic to assume that all software contains … Continue reading

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Hadoop MapReduce Manager In Cloud-of-clouds

When: Wednesday, 2014-May-28, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Pedro Costa Abstract: MapReduce is used for processing large amounts of data using hundreds or thousands of machines. Hadoop MapReduce, its open-source implementation, tolerates machine failures and file corruptions. Despite their … Continue reading

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Sobre a comissão pedagógica do doutoramento DI

When: Wednesday, 2014-May-21, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Comissão pedagógica PhD DI Abstract: Nesta smalltalk iremos conversar sobre a comissão pedagógica do doutoramento DI. A conversa começará com uma exposição informativa por parte dos atuais membros da comissão. Depois … Continue reading

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Reconfigurable Hardware: Design flow and Applications

When: Wednesday, 2014-Apr-30, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Ricardo Pinto Abstract: The ability to design and implement digital circuits to perform specific functions with considerable speedups at low costs has driven the development of reconfigurable logic devices. Reconfigurable hardware … Continue reading

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Traffic Monitoring and Fault Injection in Wireless Sensor and Actuator networks

When: Wednesday, 2014-Apr-16, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Rui Caldeira Abstract: Wireless Sensor and Actuator Networks (WSANs) have become an interesting technology for supporting networking communications in different mixed-critical environments, from industrial to aerospace. Such communications are more exposed … Continue reading

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Raptor Codes

When: Wednesday, 2014-Apr-09, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: José Lopes Abstract: What if we could make UDP as reliable as TCP, but keep its inherent simplicity? Forward error correction (FEC) is a technique used in telecommunication to recover from … Continue reading

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Real-Time Wireless Communications: An Overview and Future Directions

When: Wednesday, 2014-Apr-02, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Jeferson Souza Abstract: The use of wireless communications in environments with different levels of criticality has been grown within real-world scenarios. Industrial automation, inter-vehicular and intra-vehicular communications, disaster monitoring, and health … Continue reading

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Tablet Canvas: Focus group on a new alternative way of interaction

When: Wednesday, 2014-Mar-26, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: José Coelho Abstract: More and more new ways of interaction with 21st century technology have been implemented in recent years, with special focus for smartphones and tablet devices. In most cases, … Continue reading

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Very-efficient flipping of many coins

When: Wednesday, 2014-Mar-12, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Luís Brandão Abstract: Coin-flipping is a basic cryptographic primitive that allows several parties to decide a common random bit-string. In this smalltalk I’ll talk in high level about a new method … Continue reading

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Some Updates About Trusted Computing

When: Wednesday, 2014-Mar-05, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Bruno Vavala Abstract: Trusted Computing has gained lots of attention in the past few years. The need to provide verifiable guarantees for security-sensitive applications outsourced to untrusted hosts, such as Clouds … Continue reading

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LX-ListQuestion – Answering List Questions using Web as a corpus

When: Wednesday, 2014-Feb-19, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Patrícia Gonçalves Abstract: With the growth of the Internet, more people are searching for information on the Web. The combination of web growth and improvements in Information Technology has reignited the … Continue reading

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Serializing Data with Protocol Buffers

When: Wednesday, 2014-Feb-12, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Vinícius Cogo Abstract: Serializing data is the process of translating data structures or objects to a format that can be stored or transmitted to any entity, and subsequently reconstructed in any … Continue reading

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Reflecting about proofs of security

When: Wednesday, 2014-Jan-29, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Luís Brandão Abstract: In this smalltalk I’ll be presenting some ideas about proofs of security, motivated by some simple examples from cryptography. How can we prove that a protocol is secure? … Continue reading

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Hands-on Geni

When: Wednesday, 2013-Dec-11, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Pedro Costa Abstract: Introduction to the Geni networks with a full example. People that have access to the Geni testbed can bring the computer.

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Languages can save parallel programming

When: Wednesday, 2013-Oct-30, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Vasco Vasconcelos Abstract: Why is developing concurrent, distributed, and parallel applications so difficult? Abstractions are failing us; we need a fresh start and programming languages can help.

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Analysing and Reducing Network Inaccessibility IEEE 802.15.4 Wireless Communications

When: Wednesday, 2013-Oct-16, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Jeferson Souza Abstract: Network inaccessibility is a temporal issue derived from the presence of faults affecting the communication services provided by the medium access control (MAC) sublayer. The occurrence of network … Continue reading

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OWL Ontologies — Large files being constantly read

When: Wednesday, 2013-Oct-09, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: João Ferreira Abstract: Querying an ontology can be used to retrieve several bits of information. Eg, “is the heart a organ?” But biomedical ontologies are usually large, with several hundred MB … Continue reading

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How to program from multicores to clusters using X10

When: Wednesday, 2013-Sep-25, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Tiago Cogumbreiro Abstract: X10 is a parallel programming language designed with usability and productivity in mind. It boasts a modern object oriented model, an expressive distributed programming model, and structured parallel … Continue reading

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How to use threads+processes+queues in Python

When: Thursday, 2013-Sep-19, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Pedro Costa Abstract: In this session I will talk about concurrency in Python, and describe the advantages of using thread, processes and queues.

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Threat vectors of Software-Defined Networks

When: Tuesday, 2013-Jul-18, 11h30-12h00 Where: FCUL-DI, room C6.3.37 Presenter: Diego Kreutz Abstract: The main goal of this small talk is to introduce some of the threat vectors of Software-Defined Networks (SDNs). After this, we will discuss some requirements and techniques … Continue reading

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Taming the concurrency beast via static analysis

When: Tuesday, 2013-Jul-09, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Hugo Vieira Abstract: Concurrent systems are hard to get right. The number of possible behaviors easily leaves a dynamic analysis (e.g., simulation, model-checking) without answer, not to mention a team of … Continue reading

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Ontologies: multi-function tools for data representation and mining

When: Tuesday, 2013-Jul-02, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Cátia Machado Abstract: Ontologies are structured and formal representations of knowledge, providing the definition of concepts and the relations between them. In this presentation, I’m going to give an overview of … Continue reading

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BFT RADIUS/OpenID integration

When: Tuesday, 2013-Jun-25, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Oleksandr Malichevskyy Abstract: RADIUS and OpenID are two completely different protocols and have two different architectures. Each of protocols has a different proposal and usage. RADIUS is a low-level protocol which … Continue reading

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Machine Learning in High Dimensional Spaces

When: Monday, 2013-Jun-17, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Thibault Langlois Abstract: As the available computational power increases it is tempting to embrace more complex machine learning problems that involve larger amounts of data and higher dimensional spaces, with the … Continue reading

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Consensus: Filter & Merge

When: Tuesday, 2013-Jun-11, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Miguel Garcia Abstract: In this Smalltalk I will present a “old” work that was forgotten in the drawer. The idea is simple, but without practical experiments I cannot validate – yet … Continue reading

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Visualising the movies

When: Tuesday, 2013-Jun-04, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Ana Jorge Abstract: I’m a designer and my research PhD is on visualisation with time-oriented data mostly in the video and movies’ context. The goal is to use visualization techniques to … Continue reading

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When replacing HDs with SSDs doesn’t solve your problem

When: Tuesday, 2013-May-28, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Alysson Bessani Abstract: SSDs are replacing disks in desktops, laptops and even in some servers. In this talk I’ll discuss why this is happening (i.e., the nice features of SSDs) and … Continue reading

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Adaptive Indoor Positioning

When: Wednesday, 2013-May-22, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Paulo Pombinho Abstract: Location based services have been made very popular by the recent generations of mobile devices that have become available. However, location information is not always available. For example, … Continue reading

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DNA Privacy

When: Monday, 2013-May-13, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Vinícius Cogo Abstract: Would you like to have your DNA sequenced? In this smalltalk we will discuss the pros and cons in DNA sequencing, the importance of maintaining the privacy of … Continue reading

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Designing Your Own CPU in Logisim

When: Tuesday, 2013-May-07, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Luís Marques Abstract: In this smalltalk we will see how to build our own CPU in Logisim. We will start with a quick overview of some fundamentals of digital logic, computer … Continue reading

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Software-Defined Networking — Evolution or revolution?

When: Tuesday, 2013-Apr-30, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Diego Kreutz Abstract: Software-Defined Networking (SDN) looks to be the new norm in wireline and wireless networks. We are moving from static and proprietary communication infrastructures to open, dynamic and programmable … Continue reading

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Videogames & Persuasion: Effectiveness, Power and Decay

When: Tuesday, 2013-Apr-23, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Luís Duarte Abstract: Videogames and persuasive technology are two intimately connected topics. Engaging players with compelling storylines, presenting inspiring musical scores or photo-realistic graphics and providing the player with an endless … Continue reading

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Verifying Object Invariants with Dependent Types

When: Wednesday, 2013-Apr-03, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Joana Campos Abstract: In this smalltalk, I will present a simple dependently typed object-oriented language. Dependent types are types defined in terms of values that challenge the conventional distinction between the … Continue reading

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Visualization of Spatial-Temporal Information

When: Tuesday, 2013-Mar-19, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Tiago Gonçalves Abstract: In this small talk, I will present a small overview of my current PhD work. For that, I shall introduce the overall research questions/problems behind the visualization of … Continue reading

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Comparing and Quantifying the Chemical “Beauty” of Molecules

When: Tuesday, 2013-Mar-12, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Ana Teixeira Abstract: Ascertaining the similarity amongst molecules is a fundamental problem in cheminformatics. Given that similar molecules tend to have similar physico-chemical and biological properties, the notion of molecular similarity … Continue reading

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Web accessibility evaluation reporting

When: Tuesday, 2013-Mar-05, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Nádia Fernandes Abstract: In this small talk, I will introduce the essential topics of Web accessibility and Web accessibility evaluations. I will also present my evaluation methodology and its advantages and … Continue reading

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Compositional hierarchical scheduling analysis: from real-time to real-life

When: Wednesday, 2013-Feb-27, 11h30-12h00 Where: FCUL-DI, room C6.3.05 Presenter: João Craveiro Abstract In this smalltalk, I’ll briefly introduce to you the essential concepts behind compositional analysis of hierarchical scheduling frameworks, with easy to grasp metaphors to help you understand them. … Continue reading

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Hadoop Map-Reduce in Cloud of Clouds

When: Tuesday, 2013-Feb-18, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Pedro Costa Abstract: MapReduce is a framework for processing large data sets largely used in cloud computing. MapReduce implementations like Hadoop can tolerate crashes and file corruptions, but there is evidence … Continue reading

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Programming Multicores Safely

When: Tuesday, 2013-Feb-12, 2013, 11h30-12h00 Where: FCUL-DI, room C6.3.05 Presenter: Tiago Cogumbreiro Abstract: The key to develop parallel applications in a scalable way lays in using synchronization mechanisms at the “right” level of abstraction. Languages and libraries come bundled with … Continue reading

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Resilient and Real-Time Wireless Communications

When: Tuesday, 2013-Feb-05, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Jeferson Souza Abstract: Wireless communications are susceptible to numerous sources of interferences such as external electromagnetic waves, obstacles in communication path, or even glitches in the network device circuitry. These kind … Continue reading

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Semantic Similarity

When: Tuesday, 2013-Jan-29, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: João Ferreira Abstract: Semantic similarity is a technique that allows the comparison of arbitrary concepts, provided they are formally encoded in a machine-readable format. It allows the comparison of terms like … Continue reading

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Elderly and Tablets (and Facebook): Talking with Grandma

When: Monday, 2013-Jan-21, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: José Coelho Abstract: We present a novel way of motivating Social Network adoption by elderly users, by basing interaction and design of an existing service around family awareness. Following an approach … Continue reading

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Secure Two-Party Computation

When: Tuesday, 2013-Jan-15, 11h30-12h00 Where: FCUL-DI, room C6.3.38 Presenter: Luís Brandão Abstract: In this smalltalk, I will describe the goal of Secure Two Party Computation (a cryptographic functionality). As motivation, the audience will solve in practice, without math, two simple … Continue reading

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