Centro Algoritmi

Guimarães, Portugal

Centro Algoritmi

Guimarães, Portugal
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Carvalho D.,INESC Porto | Bessa M.,INESC Porto | Magalhaes L.,Centro ALGORITMI | Carrapatoso E.,INESC Porto
ACM International Conference Proceeding Series | Year: 2016

Novel input modalities such as touch, tangibles or gestures try to exploit human's innate skills rather than imposing new learning processes. However, no work has been reported that systematically evaluates how these interfaces influence users' performance, that is, assesses if one interface can be more or less appropriate for interaction regarding: (1) different age groups; and (2) different basic tasks, as content insertion or manipulation. This work presents itself as an exploratory evaluation about whether or not the users' efficiency is indeed influenced by different input modalities and age. We conducted a usability evaluation with 60 subjects to understand how different interfaces may influence the speed and accuracy of three specific age groups (children, young adults and older-adults) when dealing with a basic content insertion task. Four input modalities were considered to perform the task (keyboard, touch, tangibles and gestures) and the methodology was based on usability testing (speed, accuracy and user preference). Overall, results show that there is a statistically significant difference in speed of task completion between the age groups, and there may be indications that the type of interface that is used can indeed influence efficiency in insertion tasks, and not so much other factors like age. Also, the study raises new issues regarding the "old" mouse input versus the "new" input modalities. © 2016 ACM.


Silva R.,Centro ALGORITMI | Sobral J.L.,Centro ALGORITMI
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

This paper presents the Gaspar data-centric framework to develop high performance parallel applications in Java. Our approach is based on data iterators and on the map pattern of computation. The framework provides an efficient data Application Programming Inter-face(API) that supports flexible data layout and data tiling. Data layout and tiling enable the improvement of data locality, which is essential to foster application scalability in modern multi-core systems. The paper presents the framework data-centric concepts and shows that the performance is comparable to pure Java code. © Springer International Publishing AG 2017.


Lopes I.M.,Polytechnic Institute of Bragança | Lopes I.M.,Centro ALGORITMI | Oliveira P.,Polytechnic Institute of Bragança
Iberian Conference on Information Systems and Technologies, CISTI | Year: 2017

The main goal of the smart cities initiative is to enable cities to manage their assets efficiently, investing in innovation and creativity as a way to promote sustainable and inclusive urban development. When tackling such an emerging and promising area as this one of intelligent cities, it is important to know whether all cities can be fitted into this concept regardless of their size or location, thus promoting social equity throughout the whole Portuguese territory. The Portuguese Smart Cities Network includes 46 municipalities throughout the national territory. There are a lower number of such cities located in the interior part of the country. This was one of the reasons leading to this research work aiming to find out whether a city the interior (remote regions) can be considered a smart city and in what dimensions it bets. There are a number of dimensions of action that a city can explore in order to be considered a smart city. Considering the place under study, the aims of this research work are to ascertain what dimensions are being adopted to increase the efficiency of the city's resources and services management. © 2017 AISTI.


Joao C.,University of Minho | Henriques P.R.,University of Minho | da Cruz D.,Centro Algoritmi
Communications in Computer and Information Science | Year: 2015

The definition of metrics and their evaluation process is an activity intrinsic to each engineering branch and it has to do with the need to reason quantitatively about the quality of the developed products. Years ago software engineers working on the field of formal languages and grammars came out with the idea of measuring grammars. However no much progress was done in this trend; there is a clear lack for tools to automatize the computation of some grammar metrics grammars. In this paper we will introduce a tool, GQE, aimed at evaluating a new set of simple metrics for attribute grammars (AG) in order to help on the assessment of AGs quality. © Springer International Publishing Switzerland 2015.


Garcia R.,University of the Basque Country | Melle-Franco M.,Centro ALGORITMI | Mateo-Alonso A.,University of the Basque Country | Mateo-Alonso A.,Ikerbasque
Chemical Communications | Year: 2015

A pyrene-fused pyrazaacene with only four linearly-fused aromatic rings is reported, which remarkably shows emission at red to NIR wavelengths (λem = 687 nm). This exceeds the emission wavelengths observed for azaacenes with the same number of linearly-fused rings. © 2015 The Royal Society of Chemistry.


PubMed | CIC Nanogune, University of the Basque Country and Centro ALGORITMI
Type: Journal Article | Journal: Physical chemistry chemical physics : PCCP | Year: 2016

The synthesis and characterisation of a pyrene-fused tetraazaheptacene that is constituted of two terminal pyrene units and a central tetraazaanthracene core are reported. The optoelectronic properties (experimental and calculated) of this heptacene derivative are discussed together with its charge transport properties in thin films.


Taivan C.,Centro Algoritmi
PerDis 2015 - Proceedings: 4th ACM International Symposium on Pervasive Displays | Year: 2015

In this paper, we discuss the case of an online service - The Knowledge Window, which helps in the dissemination of printed posters associated to a specific type of place, e.g., university. Our demo consists in a responsive web-based software that can assist people in the consumption of relevant information while being engaged into an embodied type of experience. The main goal of this demo is to provide an effective technology to foster information consumption right in the place and beyond. © 2015 ACM.


Matos C.,University of Trás os Montes e Alto Douro | Teixeira C.A.,University of Trás os Montes e Alto Douro | Bento R.,University of Trás os Montes e Alto Douro | Bento R.,INESC Porto | And 3 more authors.
Science of the Total Environment | Year: 2014

Any strategy of water demand management needs the collaboration of the population involved and so it is important to know how characteristics as residence area, number of residents, presence/absence of children/elders, income level, and educational level, among others, may influence the use of water. Empirical studies that quantify relationship between socio-demographic factors and the water end use patterns inside buildings are still largely lacking.To help to fill this gap this paper gathers information about the characterization of water end use per domestic device in three regions of north of Portugal with different socio-demographic characteristics. The main research goal was to establish indoor water end use patterns per domestic device and to evaluate possible relations between these patterns with the socio-demographic characteristics of the area where the household is, namely the number of residents, the presence/absence of children/elders, the income level and educational level.The washbasin is in average the domestic device with more number of uses in a day (responsible for 34% of the total use), close followed by the kitchen sink (32%), the toilet flush (23%), the bathtub (6%) and finally the dishwasher (3%) and the washing machine (2%). The results found might reflect differences in rural and urban lifestyles once that, with the exception of the kitchen sink, Valpaços is the city that registers the lowest number of uses in the appliances monitored. Significant correlations were found in the following cases: between the residence area and the number of uses in washbasin and in the toilet flush; between the presence of children in the household and the use in the dishwasher; between the income level and the number of uses in the washbasin, in the bathtub, in the washing machine and in the dishwasher. © 2013 Elsevier B.V.


Taivan C.,Centro Algoritmi | Jose R.,Centro Algoritmi
PerDis 2014 - Proceedings: 3rd ACM International Symposium on Pervasive Displays 2014 | Year: 2014

We envision that future public display networks will be more interactive and open to applications from third parties similar to what we already have with smartphones. This paper investigates the application landscape for interactive public displays aiming to understand what would be the design and usage space for this type of applications. In particular, we explore people's perceptions and expectations regarding the diversity of applications that may emerge in future application ecosystems for public displays. We have devised a research methodology anchored on what is currently the rich and diverse range of applications in the mobile application market. We used a set of 75 mobile applications from Google Play application store and asked 72 participants about their relevance for public displays. The results showed that people had a clear preference for applications that disseminate content, and also that these preferences are affected by the type of location where the displays are deployed. These insights improve the understanding of the variables that may affect diversity in future display application ecosystems and inform the development of potential app stores in this context. Categories and Subject Descriptors H.5 [Information Interfaces and Presentation]: Miscellaneous General Terms Design, Experimentation, Human Factors.


Cortez P.,Centro Algoritmi | Embrechts M.J.,Rensselaer Polytechnic Institute
Information Sciences | Year: 2013

In this paper, we propose a new visualization approach based on a Sensitivity Analysis (SA) to extract human understandable knowledge from supervised learning black box data mining models, such as Neural Networks (NNs), Support Vector Machines (SVMs) and ensembles, including Random Forests (RFs). Five SA methods (three of which are purely new) and four measures of input importance (one novel) are presented. Also, the SA approach is adapted to handle discrete variables and to aggregate multiple sensitivity responses. Moreover, several visualizations for the SA results are introduced, such as input pair importance color matrix and variable effect characteristic surface. A wide range of experiments was performed in order to test the SA methods and measures by fitting four well-known models (NN, SVM, RF and decision trees) to synthetic datasets (five regression and five classification tasks). In addition, the visualization capabilities of the SA are demonstrated using four real-world datasets (e.g., bank direct marketing and white wine quality). © 2012 Elsevier Inc. All rights reserved.

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