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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.


Marco A.B.,University of the Basque Country | Gozalvez C.,University of the Basque Country | Olano M.,University of the Basque Country | Sun X.,CIC Nanogune | And 6 more authors.
Physical Chemistry Chemical Physics | 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. © 2016 The Owner Societies.


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 | Jose R.,Centro Algoritmi | Silva B.,Centro Algoritmi
Computer Systems Science and Engineering | Year: 2015

Open Display Networks represent a new paradigm for large scale networks of public displays that are open to applications and content from third parties. Web technologies may be particularly interesting as a technological framework for third-party application development in Open Display Networks because of their portability and widespread use. However, there are also significant challenges involved that result from the specificities of this particular usage domain and the lack of specific development insights for this context. In this work, we address the concept of public display application (display app) from a development perspective. The overall goal of this paper is to identify and characterize some of the key specificities of display applications and the appropriate Web solutions that can serve in the development of this type of application. The contribution of this paper builds on our extensive experience with the application development for a real world public display infrastructure and also on a short-term experiment with third party developers. Overall, the results show that Web technologies are valuable building blocks for public displays applications and their adoption is not only a subject for adaptation procedures but also for redesigning their use according to the characteristics and user experience offered by public displays. This research will inform the design of new Web-based models of display applications and shed light on the challenges that may impede third party development and the evolution of an application ecosystem in this area. © 2015 CRL Publishing Ltd.


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.


Silva P.S.,Coimbra Institute of Accounting and Administration | Trigo A.,Coimbra Institute of Accounting and Administration | Varajao J.,University of Trás os Montes e Alto Douro | Varajao J.,Centro ALGORITMI | Pinto T.,University of Trás os Montes e Alto Douro
Communications in Computer and Information Science | Year: 2010

Simulation in last decades has been widely used to analyze the impact of different scenarios in several areas like, for instance, health, military, business, and many others. When well used, it is an excellent tool to analyze alternative actions and to anticipate their impact, in order to rationalize the spending of resources. This paper introduces and resumes some of the main concepts of simulation, identifying and describing: systems; models; entities and attributes; resources; contexts of use; and, in particularly, the discrete-event simulation. © 2010 Springer-Verlag.

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