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Publications

2022

Typed SLD-Resolution: Dynamic Typing for Logic Programming

Authors
Barbosa, J; Florido, M; Costa, VS;

Publication
LOGIC-BASED PROGRAM SYNTHESIS AND TRANSFORMATION (LOPSTR 2022)

Abstract
The semantic foundations for logic programming are usually separated into two different approaches. The operational semantics, which uses SLD-resolution, the proof method that computes answers in logic programming, and the declarative semantics, which sees logic programs as formulas and its semantics as models. Here, we define a new operational semantics called TSLD-resolution, which stands for Typed SLD-resolution, where we include a value wrong, that corresponds to the detection of a type error at run-time. For this we define a new typed unification algorithm. Finally we prove the correctness of TSLD-resolution with respect to a typed declarative semantics.

2022

Bringing a Horse to Water: The Shaping of a Child Successor in Family Business Succession

Authors
Wasim, J; Almeida, F;

Publication
European Journal of Family Business

Abstract
This study critically investigates and evaluates the childhood and adolescent year strategies, and efforts that parent-owners of family businesses incorporate to encourage and prepare children for a successful future succession. The sample consisted of six family businesses in the North East of Scotland: two successfully introduced a second-generation, two a third generation and one a fourth generation, with one still in the founder stage. The findings reveal that the succession planning process was an instantaneous event into generational bridging, where no formal planning process was commenced. Parent-owners influenced and facilitated knowledge transfer and education, leaving control to the child successors with career options. The research has also shown the difficulties in how the child successors of the future may find succession challenging and demanding with contextually complex issues. © 2022: Jahangir Wasim, Fernando Almeida.

2022

The Internationalization of Nongovernmental Organizations: Characteristics and Challenges

Authors
Gaspar, B; Moreira, AC; Cercas, C; Queiros, R; Campos, S;

Publication
ADMINISTRATIVE SCIENCES

Abstract
Although the internationalization of business firms has been intensively studied, the internationalization of nongovernmental organizations (NGOs) is still in a growing-up stage as NGOs are focused on serving specific social interests. They may not only be influenced by social, political, and economic goals, but also cater to social or humanitarian services dealing with health, environmental protection, and human rights. Based on the importance of NGOs and the lack of previous studies on their internationalization process, this paper analyzes the results of a systematic literature review (SLR) on the internationalization of NGOs. It is possible to conclude that this topic is under-researched and fragmented and has been dealt with by following qualitative studies. Moreover, the internationalization of NGOs is far from similar to the models that explain the internationalization of for-profit businesses. NGOs are clearly tuned to the services they provide and seek complementary resources from governmental sources and state agencies so that they are capable of providing a variety of human and financial resources. The main limitation of this study is that it is based solely on two academic databases: SCOPUS and WoS.

2022

Innovation, Technology and Profound Change in Society – What Exists beyond ‘Like’?

Authors
Au-Yong-Oliveira, M;

Publication
Innovation, Technology and Profound Change in Society – What Exists beyond ‘Like’?

Abstract

2022

Intelligent Monitoring and Management Platform for the Prevention of Olive Pests and Diseases, Including IoT with Sensing, Georeferencing and Image Acquisition Capabilities Through Computer Vision

Authors
Alves, A; Morais, AJ; Filipe, V; Pereira, JA;

Publication
DISTRIBUTED COMPUTING AND ARTIFICIAL INTELLIGENCE, VOL 2: SPECIAL SESSIONS 18TH INTERNATIONAL CONFERENCE

Abstract
Climate change affects global temperature and precipitation patterns. These effects, in turn, influence the intensity and, in some cases, the frequency of extreme environmental events, such as forest fires, hurricanes, heat waves, floods, droughts, and storms. In general, these events can be particularly conducive to the appearance of plant pests and diseases. The availability of models and a data collection system is crucial to manage pests and diseases in sustainable agricultural ecosystems. Agricultural ecosystems are known to be complex, multivariable, and unpredictable. It is important to anticipate crop pests and diseases in order to improve its control in a more ecological and economical way (e.g., precision in the use of pesticides). The development of an intelligent monitoring and management platform for the prevention of pests and diseases in olive groves at Trás-os- Montes region will be very beneficial. This platform must: a) integrate data from multiple data sources such as sensory data (e.g., temperature), biological observations (e.g., insect counts), georeferenced data (e.g., altitude) or digital images (e.g., plant images); b) systematize these data into a regional repository; c) provide relevant forecasts for pest and diseases. Convolutional Neural Networks (CNNs) can be a valuable tool for the identification and classification of images acquired by Internet of Things (IoT).

2022

Traffic State Prediction Using One-Dimensional Convolution Neural Networks and Long Short-Term Memory

Authors
Reza, S; Ferreira, MC; Machado, JJM; Tavares, JMRS;

Publication
APPLIED SCIENCES-BASEL

Abstract
Traffic prediction is a vitally important keystone of an intelligent transportation system (ITS). It aims to improve travel route selection, reduce overall carbon emissions, mitigate congestion, and enhance safety. However, efficiently modelling traffic flow is challenging due to its dynamic and non-linear behaviour. With the availability of a vast number of data samples, deep neural network-based models are best suited to solve these challenges. However, conventional network-based models lack robustness and accuracy because of their incapability to capture traffic's spatial and temporal correlations. Besides, they usually require data from adjacent roads to achieve accurate predictions. Hence, this article presents a one-dimensional (1D) convolution neural network (CNN) and long short-term memory (LSTM)-based traffic state prediction model, which was evaluated using the Zenodo and PeMS datasets. The model used three stacked layers of 1D CNN, and LSTM with a logarithmic hyperbolic cosine loss function. The 1D CNN layers extract the features from the data, and the goodness of the LSTM is used to remember the past events to leverage them for the learnt features for traffic state prediction. A comparative performance analysis of the proposed model against support vector regression, standard LSTM, gated recurrent units (GRUs), and CNN and GRU-based models under the same conditions is also presented. The results demonstrate very encouraging performance of the proposed model, improving the mean absolute error, root mean squared error, mean percentage absolute error, and coefficient of determination scores by a mean of 16.97%, 52.1%, 54.15%, and 7.87%, respectively, relative to the baselines under comparison.

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