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Publicações

2020

Surface Plasmon Resonance sensor based on a D-shaped photonic crystal fiber with a bimetallic layer

Autores
Cardoso, MP; Silva, AO; Romeiro, AF; Giraldi, MTR; Costa, JC; Santos, JL; Baptista, JM; Guerreiro, A;

Publicação
EPJ Web of Conferences

Abstract
The investigation of a D-shaped photonic crystal fiber sensor with a bimetallic layer for operation at the visible and infrared spectra is presented. The bimetallic layer is composed by silver and gold slabs deposited adjacently on the flat face of the fiber. It is shown that this architecture allows the excitation of two sharply distinguished plasmon resonance, which suggest potential applications for multiparameter sensing.

2020

Towards Endowing Collaborative Robots with Fast Learning for Minimizing Tutors' Demonstrations: What and When to Do?

Autores
Cunha, A; Ferreira, F; Erlhagen, W; Sousa, E; Louro, L; Vicente, P; Monteiro, S; Bicho, E;

Publicação
FOURTH IBERIAN ROBOTICS CONFERENCE: ADVANCES IN ROBOTICS, ROBOT 2019, VOL 1

Abstract
Programming by demonstration allows non-experts in robot programming to train the robots in an intuitive manner. However, this learning paradigm requires multiple demonstrations of the same task, which can be time-consuming and annoying for the human tutor. To overcome this limitation, we propose a fast learning system - based on neural dynamics - that permits collaborative robots to memorize sequential information from single task demonstrations by a human-tutor. Important, the learning system allows not only to memorize long sequences of sub-goals in a task but also the time interval between them. We implement this learning system in Sawyer (a collaborative robot from Rethink Robotics) and test it in a construction task, where the robot observes several human-tutors with different preferences on the sequential order to perform the task and different behavioral time scales. After learning, memory recall (of what and when to do a sub-task) allows the robot to instruct inexperienced human workers, in a particular human-centered task scenario.

2020

The InBIO Barcoding Initiative Database: contribution to the knowledge on DNA barcodes of Iberian Plecoptera

Autores
Ferreira, S; de Figueroa, JMT; Martins, FMS; Verissimo, J; Quaglietta, L; Grosso Silva, JM; Lopes, PB; Sousa, P; Pauperio, J; Fonseca, NA; Beja, P;

Publicação
BIODIVERSITY DATA JOURNAL

Abstract
Background The use of DNA barcoding allows unprecedented advances in biodiversity assessments and monitoring schemes of freshwater ecosystems; nevertheless, it requires the construction of comprehensive reference collections of DNA sequences that represent the existing biodiversity. Plecoptera are considered particularly good ecological indicators and one of the most endangered groups of insects, but very limited information on their DNA barcodes is available in public databases. Currently, less than 50% of the Iberian species are represented in BOLD. New information The InBIO Barcoding Initiative Database: contribution to the knowledge on DNA barcodes of Iberian Plecoptera dataset contains records of 71 specimens of Plecoptera. All specimens have been morphologically identified to species level and belong to 29 species in total. This dataset contributes to the knowledge on the DNA barcodes and distribution of Plecoptera from the Iberian Peninsula and it is one of the IBI database public releases that makes available genetic and distribution data for a series of taxa. The species represented in this dataset correspond to an addition to public databases of 17 species and 21 BINs. Fifty-eight specimens were collected in Portugal and 18 in Spain during the period of 2004 to 2018. All specimens are deposited in the IBI collection at CIBIO, Research Center in Biodiversity and Genetic Resources and their DNA barcodes are publicly available in the Barcode of Life Data System (BOLD) online database. The distribution dataset can be freely accessed through the Global Biodiversity Information Facility (GBIF).

2020

Sleeping beauties and their princes in international business

Autores
Teixeira, AAC; Fonseca, A; Vieira, PC;

Publicação
JOURNAL OF BUSINESS & FINANCE LIBRARIANSHIP

Abstract
The literature on 'Sleeping Beauties' (SBs), papers that have been 'asleep' for a certain amount of time and that, suddenly, gain a significant amount of attention, is not very extensive, and has analyzed the phenomenon mainly in the Sciences. The present study seeks to find the SBs and their 'Princes' (first studies citing the SBs that have more citations and more co-citations with the SBs) in the field of International Business (IB). In terms of methodology we resort to a model that involves citation and co-citation analyses applied to a sample of 19419 papers on IB published in journals indexed in Web of Science bibliographic database. Four main findings can be highlighted: 1) SBs are a rare phenomenon in IB as only 8 SBs were found (0.04% of the total papers analyzed); 2) They focused issues related to the process of firm internationalization, international entrepreneurship, global strategies, and performance and risk management; 3) They were published in highly renowned journals, such as Journal of International Business Studies; Journal of Management Studies or Strategic Management Journal; and 4) They slept between 5 and 18 years and were awaked by 22 princes. Differently from what has been stressed in the literature about SBs, most SBs in IB presented more than one 'awakening time' and were composed by 'clusters' of princes instead of a single prince. The study of SBs is a useful and instructive model in studying the mechanisms of scientific information flow through citations. It highlights that the excessive reliance on articles' current citations might prevent the uncovering of studies that are ahead of their time.

2020

Applying Software Static Analysis to ROS: The Case Study of the FASTEN European Project

Autores
Neto, T; Arrais, R; Sousa, A; Santos, A; Veiga, G;

Publicação
FOURTH IBERIAN ROBOTICS CONFERENCE: ADVANCES IN ROBOTICS, ROBOT 2019, VOL 1

Abstract
Modern industry is shifting towards flexible, advanced robotic systems to meet the increasing demand for custom-made products with low manufacturing costs and to promote a collaborative environment for humans and robots. As a consequence of this industrial revolution, some traditional, mechanical- and hardware-based safety mechanisms are discarded in favour of a safer, more dependable robot software. This work presents a case study of assessing and improving the internal quality of a European research mobile manipulator, operating in a real industrial environment, using modern static analysis tools geared for robotic software. Following an iterative approach, we managed to fix about 90% of the reported issues, resulting in code that is easier to use and maintain.

2020

Exploring the Organizational and Technological Implications on Strategic Business Model Change

Autores
Roque, J; Santos, JD; Simões, J; Almeida, F;

Publicação
Dynamic Strategic Thinking for Improved Competitiveness and Performance - Advances in Business Strategy and Competitive Advantage

Abstract
The purpose of this chapter is to identify and analyze the main organizational and technological factors that play a relevant role in a transformational strategic change inherent in changing the business model supported on the internet. An analysis was made of the different business models, as well as their connection to strategic management and how this is accomplished in the organizational and technological plan. This empirical study, based on the qualitative methodology, focuses on a single case study on a Portuguese company that recently changed its business model. The findings allowed the authors to assess the advantages and challenges posed by the transformation of an initial business based on a website that performs a comparison of prices for an integrated model based on a marketplace, in which customers can make their purchases and access all products, from different stores, in one place.

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