Ligeiro R.,INOV INESC Inovacao
Journal of Computational Science | Year: 2017
According to quantum mechanics there exists a small probability for a particle to pass through a barrier. The principle behind this assertion is known as Quantum Tunnelling effect because the escaping particle has to, somehow, dig a passage to the other side of the barrier. When placed in a proper context, this nonlocal phenomenon can be a powerful concept for solving combinatorial problems. The strategy used consists in simulating quantum tunnels aiming to find approximate solutions for a particular optimum of a combinatorial cost function. In this paper we present such a scheme, composed by a finite number of linked Markov Chains. Each Markov Chain is connected with its adjacent by a link that mimics a quantum tunnel. The numerical practicality of the model is demonstrated using the traditional one-dimensional Bin Packing Problem. © 2017 Elsevier B.V.
Lavrov A.,INOV Inesc Inovacao |
Utkin A.B.,University of Lisbon |
Vilar R.,INOV Inesc Inovacao |
Vilar R.,University of Lisbon
Optics and Spectroscopy (English translation of Optika i Spektroskopiya) | Year: 2010
A simple and robust eye-safe lidar was developed on the basis of a rangefinder optical scheme comprising an Er:glass laser which generates 8 mJ pulses of 1540-nm radiation with the pulse repetition rate of 0.17 Hz and a 38-mm-diameter telescope. Reliable measurements of the cloud height up to 3700 m and early forest-fire detection with a range of 3000 m were experimentally demonstrated. Theoretical estimations indicate that using an optical scheme built around a 10 Hz Er:glass lasers and 150 mm light gathering optics early forest fire detection in a range up to 6500 m can be achieved. © 2010 Pleiades Publishing, Ltd.
Pinto P.L.,University of Lisbon |
Mendes C.,INOV Inesc Inovacao |
Caetano A.,University of Lisbon |
Da Silva M.M.,University of Lisbon
Proceedings of the ACM Symposium on Applied Computing | Year: 2015
The development of information technologies (IT) has increased the number of IT dependent business processes within organisations, enforcing the crucial role of IT in today's enterprise implementations. In spite of IT advances, human beings still constitute the most valuable asset of any enterprise and the cooperation between them is indispensable for the operation of business processes. Traditional business process modelling techniques have limitations regarding the acquisition process which is time-consuming and do not take fully advantage of IT to represent updated process models. Besides, these techniques are limited concerning the analysis and improvement of the resulting models. This paper proposes a method to analyse updated business processes in terms of the collaboration between the participant actor roles, taking into account the importance of IT and human beings at those processes. The method receives as input event logs extracted from the application and technological infrastructure that supports the business processes and combines techniques from both Process Mining and the Ψ-theory to analyse enterprise ontology models against the mined processes, detecting opportunities for business process reengineering. The method was applied to analyse a VPN access approval process within a national defence governmental institution. The evaluation was performed using the Osterle principles. Copyright 2015 ACM.
Mendes C.,INOV INESC INOVACAO |
Silva N.,University of Lisbon |
Silva M.,INOV INESC INOVACAO |
da Silva M.M.,University of Lisbon
Lecture Notes in Business Information Processing | Year: 2016
Business process management (BPM) activities can be divided into categories such as design, modelling, execution, monitoring, and optimization. Some of these activities are usually automated, mainly the first ones, where Automated Business Process Discovery (ABPD) solutions, also know as process mining, can automatically find process models (using unstructured, event-level logs). However, BPM usually involves several activities that are executed in different applications, which are not integrated with each other, or are even manually executed. This may involve the waste of resources and time, and eventually not applying BPM with full potential. We propose an integrated solution, that allows to complete the BPM cycle in a single application and with most of the steps automatically. This proposal was applied in practice in the context of a research project and the results are being integrated into a commercial product. © Springer International Publishing Switzerland 2016.
Gameiro C.,University of Lisbon |
Utkin A.B.,INOV INESC Inovacao |
Utkin A.B.,University of Lisbon |
Cartaxana P.,Copenhagen University |
And 2 more authors.
Agricultural Water Management | Year: 2016
Chlorophyll fluorescence measurements have been widely applied as non-destructive methods to study the photosynthetic efficiency of plants, under control or stress conditions. Compared to most protocols of pulse amplitude modulation (PAM) fluorometry, laser induced chlorophyll fluorescence (LIF) has the advantages of not requiring pulses to be delivered at close range, allowing the remote analysis of a great number of individual plants in a short period of time. Such analyses are extremely useful, for instance, when doing large phenotyping screens of Arabidopsis thaliana mutants or ecotypes. Water deficit is a major abiotic stress compromising plant growth and productivity. Arabidopsis has been adopted as the main model organism in plant sciences and it has been widely used in plant stress studies. However, reports on the applications of LIF techniques to this model plant are scarce. Here we report the use of LIF to investigate changes in chlorophyll a (Chl a) fluorescence signature under progressive drought of potted Arabidopsis plants (Slow Stress) and under fast dehydration of detached leaves (Fast Stress). Results show that the two dehydration methods cause distinct modifications on the red/far-red Chl a fluorescence ratio (F690/F730) and on the wavelengths of Chl a fluorescence maxima. These differences are likely related to distinct changes in water content, photosynthetic pigments, anthocyanins, fatty acid composition and other metabolic adaptations, which are differently regulated in Slow and Fast Stress. Of particular interest are Chl a emission fluorescence changes, which take place under progressive drought, before a substantial decrease in leaf water content. Additionally, no differences were found on LIF emission spectra between fully expanded and young leaves. However, the choice of leaf surface influenced fluorescence emission, with the abaxial surface displaying lower fluorescence and higher F690/F730 ratios. Results suggest that LIF is a fast and non-destructive tool suitable for high-throughput phenotyping of Arabidopsis under water deficit. © 2015 Elsevier B.V.
Utkin A.B.,INOV Inesc Inovacao |
Utkin A.B.,University of Lisbon
Wave Motion | Year: 2012
The method of incomplete separation of variables is applied for solving the wave propagation problems in which the source distribution and the emanated wave are constrained by an elliptic cylinder. Solutions are obtained in the form of expansions in terms of the Mathieu modes, whose completeness makes possible to solve the problem for arbitrary source distribution and initial values of the wavefunction and its time derivative defined within the cylinder. Transient modal amplitudes are found using the Riemann (Riemann-Volterra) method. An important feature of this approach is the straightforward definition of the essentially bounded effective integration areas on the plane spanned by the longitudinal and time coordinates, taking into account the spatiotemporal constraints imposed on the source. For source turned on in a fixed instant, the method is capable to model wave propagation inside the semi-infinite and finite elliptic cylinders provided that the Dirichlet or Neumann boundary conditions are specified on the limiting cross-section(s). Recent techniques of transverse-longitudinal wave decomposition open the prospect of adapting the method to more general cylindrical configurations and to other cases, in which the incomplete separation of variables results in partial differential equations of a known Riemann function (such as the Euler-Poisson-Darboux equation). © 2011 Elsevier B.V.
Diago M.P.,University of La Rioja |
Fernandez-Novales J.,University of La Rioja |
Fernandes A.M.,INOV INESC Inovacao |
Melo-Pinto P.,University of Trás os Montes e Alto Douro |
Tardaguila J.,University of La Rioja
Journal of Agricultural and Food Chemistry | Year: 2016
In red grape berries, anthocyanins account for about 50% of the skin phenols and are responsible for the final wine color. Individual anthocyanin levels and compositional profiles vary with cultivar, maturity, season, region, and yield and have been proposed as chemical markers to differentiate wines and to provide valuable information regarding the adulteration of musts and wines. A fast, easy, solvent-free, nondestructive method based on visible, short-wave, and near-infrared hyperspectral imaging (HSI) in intact grape berries to fingerprint the color pigments in eight different grape varieties was developed and tested against HPLC. Predictive models based on modified partial least-squares (MPLS) were built for 14 individual anthocyanins with coefficients of determination of cross-validation (R2 CV) ranging from 0.70 to 0.93. For the grouping of total and nonacylated anthocyanins, external validation was conducted with coefficient of determination of prediction (R2 P) of 0.86. HSI could potentially become an alternative to HPLC with reduced analysis time and labor costs while providing reliable and robust information on the anthocyanin composition of grape berries. © 2016 American Chemical Society.
PubMed | University of Trás os Montes e Alto Douro, INOV INESC Inovacao and University of La Rioja
Type: Journal Article | Journal: Journal of agricultural and food chemistry | Year: 2016
In red grape berries, anthocyanins account for about 50% of the skin phenols and are responsible for the final wine color. Individual anthocyanin levels and compositional profiles vary with cultivar, maturity, season, region, and yield and have been proposed as chemical markers to differentiate wines and to provide valuable information regarding the adulteration of musts and wines. A fast, easy, solvent-free, nondestructive method based on visible, short-wave, and near-infrared hyperspectral imaging (HSI) in intact grape berries to fingerprint the color pigments in eight different grape varieties was developed and tested against HPLC. Predictive models based on modified partial least-squares (MPLS) were built for 14 individual anthocyanins with coefficients of determination of cross-validation (R
Ramos H.,INOV Inesc Inovacao |
Vasconcelos A.,INOV Inesc Inovacao
Proceedings of the ACM Symposium on Applied Computing | Year: 2014
When developing enterprise architectures, in the same way as software products, companies have to deal a constant growth on the clients demand for faster results, while facing, at the same time, a big uncertainty on the requirements surrounding the project. This paper tries to investigate the similarities between the difficulties faced in both industries of EA and software development, and propose an extension to Enterprise Architecture Planning methodology , by introducing "agile" characteristics into it as a way to address the problems identified. Copyright 2014 ACM.
Utkin A.B.,INOV Inesc Inovacao
Proceedings of the International Conference Days on Diffraction, DD 2010 | Year: 2010
The Cauchy problem for the inhomogeneous wave equation is solved for the case in which both the source and the emanated wave are constrained by an elliptical cylinder. The solution is obtained in the elliptic cylindrical coordinates using an expansion in terms of the elliptic-membrane vibration modes and the Riemann method. © 2010 Days on Diffraction.