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Displaying 1-50 out of 209 total
Nmap: A Novel Neighborhood Preservation Space-filling Algorithm
Found in: IEEE Transactions on Visualization and Computer Graphics
By Felipe Duarte,Fabio Sikansi,Francisco Fatore,Samuel Fadel,Fernando Paulovich
Issue Date:February 2015
pp. 1
Space-filling techniques seek to use as much as possible the visual space to represent a dataset, splitting it into regions that represent the data elements. Amongst those techniques, Treemaps have received wide attention due to its simplicity, reduced vis...
An Autonomic Implementation of Reliable Broadcast Based on Dynamic Spanning Trees
Found in: 2014 Tenth European Dependable Computing Conference (EDCC)
By Luiz A. Rodrigues,Luciana Arantes,Elias P. Duarte
Issue Date:May 2014
pp. 1-12
Reliable broadcast is a basic building block of dependable distributed systems that allows the dissemination of messages to all processes guaranteeing that either none or all correct processes deliver the message, despite the occurrence of failures. In thi...
Analysis of Search and Browsing Behavior of Young Users on the Web
Found in: ACM Transactions on the Web (TWEB)
By Djoerd Hiemstra, Ingmar Weber, Sergio Duarte Torres
Issue Date:March 2014
pp. 1-54
The Internet is increasingly used by young children for all kinds of purposes. Nonetheless, there are not many resources especially designed for children on the Internet and most of the content online is designed for grown-up users. This situation is probl...
Speech Recognition for Voice-Based Machine Translation
Found in: IEEE Software
By Tiago Duarte,Rafael Prikladnicki,Fabio Calefato,Filippo Lanubile
Issue Date:January 2014
pp. 26-31
Real-time voice-based machine translation is stimulated by many international teams who want to understand each other syntactically as well as semantically. Authors Tiago Duarte and Rafael Prikladnicki provide an overview on current technologies for real-t...
Modeling, Characterization and Recommendation of Multimedia Web Content Services
Found in: 2013 IEEE International Symposium on Multimedia (ISM)
By Diego Duarte,Adriano C.M. Pereira,Clodoveu Davis
Issue Date:December 2013
pp. 179-186
Web multimedia content has reached much importance lately. One of the most important content types is online video, as demonstrated by the success of platforms such as YouTube. The growth in the volume of available online video is also observed in corporat...
Evaluation of the Huffman Encoding for Memory Optimization on Hardware Network Intrusion Detection
Found in: 2013 III Brazilian Symposium on Computing Systems Engineering (SBESC)
By Eder Freire,Leizer Schnitman,Wagner Oliveira,Angelo Duarte
Issue Date:November 2013
pp. 131-136
The design of specialized hardware for Network Intrusion Detection has been subject of intense research over the last decade due to its considerably higher performance compared to software implementations. In this context, one of the limiting factors is th...
A generative computer language to customize online learning assessments
Found in: Proceedings of the First International Conference on Technological Ecosystem for Enhancing Multiculturality (TEEM '13)
By Antonio Balderas, Juan M. Dodero, Manuel Palomo-Duarte, Iván Ruiz-Rube
Issue Date:November 2013
pp. 141-147
The focus on assessment of learning experiences has shifted from knowledge to competences. Unfortunately, assessing certain competences is mainly a subjective task, being problematic for both the evaluators and the evaluated. Additionally, when the learnin...
A contribution to the quality evaluation of mobile learning environments
Found in: 2013 IEEE Frontiers in Education Conference (FIE)
By Nemesio Freitas Duarte Filho,Ellen Francine Barbosa
Issue Date:October 2013
pp. 379-382
In recent years, issues related to teaching and learning have been more and more discussed and investigated by the scientific community. Mobile learning (m-learning) environments, despite the benefits provided, are still considered as new and incipient pro...
On the performance and energy-efficiency of multi-core SIMD CPUs and CUDA-enabled GPUs
Found in: 2013 IEEE International Symposium on Workload Characterization (IISWC)
By Ronald Duarte,Resit Sendag,Frederick J. Vetter
Issue Date:September 2013
pp. 174-184
This paper explores the performance and energy efficiency of CUDA-enabled GPUs and multi-core SIMD CPUs using a set of kernels and full applications. Our implementations efficiently exploit both SIMD and thread-level parallelism on multi-core CPUs and the ...
Creating secrets out of erasures
Found in: Proceedings of the 19th annual international conference on Mobile computing & networking (MobiCom '13)
By Christina Fragouli, Katerina Argyraki, Marios Gatzianas, Melissa Duarte, Panagiotis Kostopoulos, Suhas Diggavi
Issue Date:September 2013
pp. 429-440
Current security systems often rely on the adversary's computational limitations. Wireless networks offer the opportunity for a different, complementary kind of security, which relies on the adversary's limited network presence (i.e., that the adversary ca...
Self-* properties and P2P technology on disruption-tolerant management
Found in: 2013 IEEE Symposium on Computers and Communications (ISCC)
By Jeferson Campos Nobre,Pedro Arthur Pinheiro Rosa Duarte,Lisandro Zambenedetti Granville,Liane Margarida Rockenbach Tarouco
Issue Date:July 2013
pp. 000676-000681
The introduction of self-* properties has been proven to be a feasible approach for the management demands of Disruption-Tolerant Networks (DTNs). Among the properties of the self-* management vision, self-healing figures as a key property to improve the d...
From framework programme 7 to Horizon 2020
Found in: Proceedings of the 2013 International Conference on Information Systems and Design of Communication (ISDOC '13)
By Filipa Duarte
Issue Date:July 2013
pp. 142-142
This panel will discuss the strength and weaknesses of the Portuguese participation on the FP7 ICT Theme. We will also discuss and identify possible strategies for increase the success rate of the Portuguese institutions in submission to the new framework ...
Quantize-map-forward (QMF) relaying: an experimental study
Found in: Proceedings of the fourteenth ACM international symposium on Mobile ad hoc networking and computing (MobiHoc '13)
By Ayan Sengupta, Christina Fragouli, Melissa Duarte, Siddhartha Brahma, Suhas Diggavi
Issue Date:July 2013
pp. 227-236
We present the design and experimental evaluation of a wireless system that exploits relaying in the context of WiFi. We opt for WiFi given its popularity and wide spread use for a number of applications, such as smart homes. Our testbed consists of three ...
Vertical selection in the information domain of children
Found in: Proceedings of the 13th ACM/IEEE-CS joint conference on Digital libraries (JCDL '13)
By Djoerd Hiemstra, Sergio Duarte Torres, Theo Huibers
Issue Date:July 2013
pp. 57-66
In this paper we explore the vertical selection methods in aggregated search in the specific domain of topics for children between 7 and 12 years old. A test collection consisting of 25 verticals, 3.8K queries and relevant assessments for a large sample of...
A Case Study Based New DEMO Way of Working and Collaborative Tooling
Found in: 2013 IEEE 15th Conference on Business Informatics (CBI)
By David Aveiro,Duarte Pinto
Issue Date:July 2013
pp. 21-26
This paper reflects some useful outcomes of a practical enterprise change project where the Design and Engineering Methodology for Organizations (DEMO) was used in the initial stage as to give a neutral and concise but comprehensive view of the organizatio...
Cloud Maturity Model
Found in: 2013 IEEE 6th International Conference on Cloud Computing (CLOUD)
By Andre Duarte,Miguel Mira Da Silva
Issue Date:June 2013
pp. 606-613
Organizations are struggling to move and manage their IT Services and/or IT-enabled Services to the Cloud, slowing the adoption of Cloud services. In our research we intend to help organizations adopt Cloud services and demystify fears and concerns. In ord...
Open data framework for sustainable assessment in software forges
Found in: Proceedings of the 3rd International Conference on Web Intelligence, Mining and Semantics (WIMS '13)
By Ignacio Traverso-Ribón, Iván Ruíz-Rube, Juan Manuel Dodero, Manuel Palomo-Duarte
Issue Date:June 2013
pp. 1-8
In a project-based learning experience, the detailed monitoring of the activities in which team members participate can be useful to evaluate their work. Using learning-oriented assessment procedures, supervisors can assess the teamwork abilities with a fo...
Umbra: beyond avatars: a gaming installation using shadows
Found in: CHI '13 Extended Abstracts on Human Factors in Computing Systems (CHI EA '13)
By Alexander Goldman, Ana Alves, Boram Han, Carlos Camacho, Duarte Teixeira, Jorge Diaz, Julia Silva, Sara Tranquada
Issue Date:April 2013
pp. 2631-2634
This document details the design and development of Umbra, an installation-based game that makes use of a semi-transparent screen projected upon from both sides. The setup enables players to be represented in-game via their shadows, instead of avatars. Thi...
The cake can be a lie: placebos as persuasive videogame elements
Found in: CHI '13 Extended Abstracts on Human Factors in Computing Systems (CHI EA '13)
By Luís Duarte, Luis Carriço
Issue Date:April 2013
pp. 1113-1118
This paper presents a research which aimed at exploring the effects that videogame temporary reinforcements (commonly known in the domain as power-ups or bonuses) have on players from a physiological and performance perspective. We specifically address thi...
Ambiguity in design: an airport split-flap display storytelling installation
Found in: CHI '13 Extended Abstracts on Human Factors in Computing Systems (CHI EA '13)
By Clinton Jorge, Duarte Sousa, Giovanni Innella, Miguel Caldeira, Nuno Nunes, Valentina Nisi
Issue Date:April 2013
pp. 541-546
This paper describes MStoryG, a digital art installation to be situated in a future open-air museum. Our goal with MStoryG is to provoke and engage visitors in collaborative storytelling by exploiting the ambiguity that visitors interpret from an airport s...
Incremental stream processing using computational conflict-free replicated data types
Found in: Proceedings of the 3rd International Workshop on Cloud Data and Platforms (CloudDP '13)
By Sérgio Duarte
Issue Date:April 2013
pp. 31-36
Information has become a key commodity for most service providers. Analyzing streams of data efficiently, in real time, has become increasingly more important for supporting new products and applications. This paper outlines a novel abstraction for perform...
Diagnosis of Content Pollution in P2P Live Streaming Networks
Found in: 2013 Sixth Latin-American Symposium on Dependable Computing (LADC)
By Roverli P. Ziwich,Emanuel A. Schimidt,Elias P. Duarte,Ingrid Jansch-Porto
Issue Date:April 2013
pp. 48-57
Content pollution is one of the challenges for massively deploying live streaming P2P networks in the Internet. As the peers themselves are responsible to retransmit data, there is no trivial solution to this problem. This work presents a new strategy to d...
A requirements catalog for mobile learning environments
Found in: Proceedings of the 28th Annual ACM Symposium on Applied Computing (SAC '13)
By Ellen Francine Barbosa, Nemésio Freitas Duarte Filho
Issue Date:March 2013
pp. 1266-1271
Mobile learning (m-learning) can be characterized by the ability to promote a strong interaction among apprentices and tutors, assuring greater motivation, convenience and flexibility to the learning process. Mobile learning environments have emerged in th...
A Software-Based Solution for Distributing and Displaying 3D UHD Films
Found in: IEEE MultiMedia
By Lucenildo Aquino Junior,R. Gomes,Manoel Silva Neto,A. Duarte,R. Costa,Guido Souza Filho
Issue Date:January 2013
pp. 60-68
As an alternative to traditional hardware-based ultra-high definition (UHD) multimedia systems, the proposed software-based approach offers a better cost-benefit ratio and might help facilitate large-scale deployment.
Capacity and Robustness Tradeoffs in Bloom Filters for Distributed Applications
Found in: IEEE Transactions on Parallel and Distributed Systems
By Marcelo Duffles Donato Moreira,Rafael Pinaud Laufer,Pedro Braconnot Velloso,Otto Carlos M.B. Duarte
Issue Date:December 2012
pp. 2219-2230
The Bloom filter is a space-efficient data structure often employed in distributed applications to save bandwidth during data exchange. These savings, however, come at the cost of errors in the shared data, which are usually assumed low enough to not disru...
SoPD -- A New Consensus Function for the Ensemble Clustering Problem
Found in: 2012 31st International Conference of the Chilean Computer Science Society (SCCC)
By Daniel Duarte Abdala,Xiaoyi Jiang
Issue Date:November 2012
pp. 234-240
This paper presents a consensus function based on a new formulation for the median partition problem to address the problem of ensemble clustering. It is based on the underlying idea of minimizing the distance between pairs of objects identified as the mos...
Query recommendation for children
Found in: Proceedings of the 21st ACM international conference on Information and knowledge management (CIKM '12)
By Djoerd Hiemstra, Ingmar Weber, Pavel Serdyukov, Sergio Duarte Torres
Issue Date:October 2012
pp. 2010-2014
One of the biggest problems that children experience while searching the web occurs during the query formulation process. Children have been found to struggle formulating queries based on keywords given their limited vocabulary and their difficulty to choo...
Parallel High Dimensional Self Organizing Maps Using CUDA
Found in: 2012 Brazilian Robotics Symposium and Latin American Robotics Symposium (SBR-LARS)
By Felipe C. Moraes,Silvia C. Botelho,Nelson Duarte Filho,Joel Felipe O. Gaya
Issue Date:October 2012
pp. 302-306
A common neural network used for complex data clustering is the Self Organizing Maps(SOM). This algorithm have a expensive training step, that occur mainly on high dimensional applications like image clustering. This makes impossible for some of these appl...
A High-Level Implementation of STM Haskell with Write/Write Conflict Detection
Found in: 2012 3rd Workshop on Applications for Multi-Core Architectures (WAMCA)
By Andre Rauber Du Bois,Mauricio Lima Pilla,Rodrigo Medeiros Duarte
Issue Date:October 2012
pp. 24-29
This paper describes a high level implementation of Software Transactional Memory (STM) for the Haskell language. The library is implemented completely in Haskell and, as opposed to all other implementation of STM Haskell, it features early detection of wr...
A Parallel Implementation of Gomory-Hu's Cut Tree Algorithm
Found in: 2012 24th International Symposium on Computer Architecture and High Performance Computing (SBAC-PAD)
By Jaime Cohen,Luiz A. Rodrigues,Elias P. Duarte Jr.
Issue Date:October 2012
pp. 124-131
Cut trees are a compact representation of the edge-connectivity between every pair of vertices of an undirected graph, and have a large number of applications. In this work a parallel version of the well known Gomory-Hu cut tree algorithm is presented. The...
Using Space D* for Crowded Real Robots Environments
Found in: 2012 Brazilian Robotics Symposium and Latin American Robotics Symposium (SBR-LARS)
By Luan Silveira,Renan Q. Maffei,Felipe Almeida,Matheus Longaray,Silvia S. C. Botelho,Paulo J. L. Drews Jr.,Alessandro de L. Bicho,Nelson L. Duarte Filho
Issue Date:October 2012
pp. 273-278
This paper describes a new method of path planning for multiple robots in unknown environments and its validation in real robots context. The method, called Space D*, is based on two algorithms: the D*, which is an incremental graph search algorithm, and t...
"Blue pill or red pill?": placebo effect and the outcome on physiological & player performance metrics
Found in: Proceedings of the 4th International Conference on Fun and Games (FnG '12)
By Luís Carriço, Luís Duarte
Issue Date:September 2012
pp. 93-96
In the videogame industry, designers have always explored techniques which provide incentives to keep the players' interest and temporarily boost their performance to accomplish the game's goals. Current literature and research is yet to properly assess th...
Puzzle games: player strategies across different interaction modalities
Found in: Proceedings of the 4th International Conference on Fun and Games (FnG '12)
By Jaime Carvalho, Luís Carriço, Luís Duarte
Issue Date:September 2012
pp. 64-72
This paper presents the design of a puzzle game for the Android platform along with a study on puzzle solving strategies across different interaction modalities. Solving puzzles is among the oldest challenges and entertainment activities available to us. H...
Power me Up!: an interactive and physiological perspective on videogames' temporary bonus rewards
Found in: Proceedings of the 4th International Conference on Fun and Games (FnG '12)
By Luís Carriço, Luís Duarte
Issue Date:September 2012
pp. 55-63
The videogame industry has suffered significant modifications in the last years, broadening its horizons towards a more casual market. This market expansion not only brings new opportunities from an interaction point-of-view, but also new challenges with t...
PSP PAIR: Automated Personal Software Process Performance Analysis and Improvement Recommendation
Found in: 2012 Eighth International Conference on the Quality of Information and Communications Technology (QUATIC)
By Cesar Barbosa Duarte,Joao Pascoal Faria,Mushtaq Raza
Issue Date:September 2012
pp. 131-136
High-maturity software development processes, making intensive use of metrics and quantitative methods, such as the Personal Software Process (PSP) and the Team Software Process (TSP), can generate a significant amount of data that can be periodically anal...
Patterns of creation and usage of Wikipedia content
Found in: 2012 IEEE 14th International Symposium on Web Systems Evolution (WSE)
By Andrea Capiluppi,Ana Claudia Duarte Pimentel,Cornelia Boldyreff
Issue Date:September 2012
pp. 85-89
Wikipedia is the largest online service storing user-generated content. Its pages are open to anyone for addition, deletion and modifications, and the effort of contributors is recorded and can be tracked in time.
A Distributed Software Development Environment Dynamics Model
Found in: 2012 7th IEEE International Conference on Global Software Engineering (ICGSE)
By Alexandre L'Erario,Jose Augusto Fabri,Andre Domingues,Alessandro Duarte,Rodrigo Pal'cios,Marcelo Schneck de Paula Pessoa
Issue Date:August 2012
pp. 184
This article presents a model of the distributed software envelopment environment. This work used the multiple case studies for create this model. The dynamics and the properties discussed in this work help as guide framework for the network managers. For ...
Competitive evaluation in a video game development course
Found in: Proceedings of the 17th ACM annual conference on Innovation and technology in computer science education (ITiCSE '12)
By Antonio Balderas, Antonio García-Domínguez, José Tomás Tocino, Juan Manuel Dodero, Manuel Palomo-Duarte
Issue Date:July 2012
pp. 321-326
The importance of the video game and interactive entertainment industries has continuously increased in recent years. Academia has introduced computer game development in its curricula. In the case of the University of Cadiz, a non-compulsory course about ...
An Evaluation Framework for Assessing and Optimizing Multimodal Fusion Engines Performance
Found in: 2012 Sixth International Conference on Complex, Intelligent, and Software Intensive Systems (CISIS)
By Pedro Feiteira,Carlos Duarte
Issue Date:July 2012
pp. 560-566
The current development of interactive systems is shifting its focus into adding new features and capabilities, encompassing for example, new input devices and ways of interacting. Some applications make use of different modalities for both input and outpu...
Information systems: life cycle and success
Found in: Proceedings of the Workshop on Information Systems and Design of Communication (ISDOC '12)
By Ana Isabel Mendes Duarte, Carlos J. Costa
Issue Date:June 2012
pp. 25-30
In this work, information systems are analyzed in the perspective of the companies that are implementing those systems. A model for evaluating the success of information systems in companies is proposed. This model is supported in the Model of DeLone and M...
Mapping interaction onto media façades
Found in: Proceedings of the 2012 International Symposium on Pervasive Displays (PerDis '12)
By Carlos A. Duarte, Nancy V. Diniz, Nuno M. Guimarães
Issue Date:June 2012
pp. 1-6
This paper discusses the emergence and need of principles and guidelines for the design of interaction spaces based on media façades, as large public interactive spaces. Media façades, as new architectural creations, are being designed and built ...
Using data envelopment analysis (DEA) to assess government web portals performance
Found in: Proceedings of the 13th Annual International Conference on Digital Government Research (dg.o '12)
By Abel Duarte-Valle, Dolores E. Luna, J. Ramon Gil-Garcia, Luis F. Luna-Reyes, Rodrigo Sandoval-Almazán
Issue Date:June 2012
pp. 107-115
In the last few years, researchers have evaluated the performance of e-government portals in order to identify best practices and understand some of the factors that influence the quality of the information and services they provide to citizens. Most of th...
A Web Service-based Framework for Temporal/Spatial Environmental Data Access
Found in: 2012 12th International Conference on Computational Science and Its Applications (ICCSA)
By Rogerio B. Andrade,Luiza Nunes,Eduardo Batista de_Moraes Barbosa,Nandamudi L. Vijaykumar,Rafael Duarte Coelho dos Santos
Issue Date:June 2012
pp. 7-13
The Weather Forecast and Climate Studies Center (CPTEC) of the Brazilian National Institute for Space Research (INPE) is responsible for weather and climate forecasts and weather data collection and dissemination. Data is collected from several different s...
Collaborative Requirements Elicitation with Visualization Techniques
Found in: 2012 IEEE 21st International Workshop On Enabling Technologies: Infrastructure For Collaborative Enterprises (WETICE)
By Diogo Duarte,Carla Farinha,Miguel Mira da Silva,Alberto Rodrigues da Silva
Issue Date:June 2012
pp. 343-348
Requirements elicitation is one of the first activities that tries to define the project scope and elicit user requirements. This activity relies in communication and cooperation between stakeholders which makes collaboration crucial for the success of thi...
MoDiVHA: A hierarchical strategy for distributed test assignment
Found in: 2012 13th Latin American Test Workshop - LATW
By Jefferson Paulo Koppe,Elias P. Duarte,Luis C. E. Bona
Issue Date:April 2012
pp. 1-6
Distributed diagnosis allows a set of fault-free nodes to monitor the state of all nodes of a given system. Diagnosis is based on the results of tests, which are assigned among system nodes. Hierarchical testing assingments lead to efficient and scalable d...
User performance tweaking in videogames: a physiological perspective of player reactions
Found in: Proceedings of the 3rd Augmented Human International Conference (AH '12)
By Luis Carrico, Luis Duarte
Issue Date:March 2012
pp. 1-8
The videogame industry has suffered significant modifications in the last years, broadening its horizons towards a more casual market. This market expansion not only brings new opportunities from an interaction point-of-view, but also new challenges with t...
Can you feel it?: sharing heart beats with Augmento
Found in: Proceedings of the 3rd Augmented Human International Conference (AH '12)
By Luis Carrico, Luis Duarte, Tiago Antunes
Issue Date:March 2012
pp. 1-5
This paper presents Augmento, a system which aims at providing individuals with an asynchronous approach of reinforcing the bonds with their relatives by sharing emotions when they are in the vicinity of places which hold special memories of their lives. A...
Therapy: location-aware assessment and tasks
Found in: Proceedings of the 3rd Augmented Human International Conference (AH '12)
By Luis Carrico, Luis Duarte, Marco de Sa, Tiago Antunes
Issue Date:March 2012
pp. 1-5
In this paper, we present a system that allows therapists to assess and engage patients' in activities triggered by specific stressing contexts. The system is composed by: 1) a web application that the therapist uses to specify the activities and its trigg...
Um Sistema Integrado para Controle de Projetos na Construção Naval com Análise de Risco
Found in: 2012 International Conference on Offshore and Marine Technology: Science and Innovation (NAVTEC)
By F.C.M. Pires Jr.,L.F. Assis,M. Rezende e C.L.B. Vieira,N. Duarte Filho,S.S.C. Botelho
Issue Date:March 2012
pp. 67-70
Após um longo período de crise, a indústria naval brasileira está passando por um novo processo de expansão. Entretanto, alguns dos problem as críticos que ainda persistem podem vir a impor barreiras à consolidação do setor. O risco do estaleiro apresenta-...
A Engenharia de Serviço na Indústria Naval
Found in: 2012 International Conference on Offshore and Marine Technology: Science and Innovation (NAVTEC)
By Diogo Paludo de Oliveira,Silvia S.C. Botelho,Nelson Lopes Duarte Filho,Jonata Tyska
Issue Date:March 2012
pp. 9-12
Este artigo busca averiguar o uso dos conceitos de Engenharia de Serviço na indústria naval brasileira, contextualizado no cenário de crescimento que este setor se encontra atualmente. Com uma abordagem utilizando Sistemas de Produto-Serviço, cada vez mais...
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