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Publicações

2023

SME Internationalization and Export Performance: A Systematic Review with Bibliometric Analysis

Autores
Calheiros-Lobo, N; Vasconcelos Ferreira, J; Au-Yong-Oliveira, M;

Publicação
Sustainability

Abstract
Building from the authors’ plan to conceptualize an artificial intelligence (AI) solution that allows SME owners to make more sustainable choices in foreign-market-entry decisions, this systematic literature review (SLR) researches the state-of-the-art in SME internationalization from 1920 to 2023 (since 2014 in more depth). The authors gather all articles in Scopus, tagged with the keyword internationalization (25,303 as of January 2023), order them by citations, and download the top 2000 papers’ metadata for analysis and debate, then narrow it to reviews and SMEs, and use bibliometric visualization and qualitative data analysis software (VOSviewer and NVivo) to identify the key players and determinants of export performance/intensity, and finally draw conclusions. The results reveal key internationalization theories, top authors, reviews, and sources and expand Werner´s determinants via several tables and figures. The findings reveal the rise of relevance regarding theories related to social narratives and corporate activism, but also show that there is still much to do in SME internationalization, namely on what makes a small firm well established in their native market and have success in other countries. The contribution to science is an update on the topic and the pinpointing of several trends and gaps, such as a focus on services, theory integration, longitudinal studies between antecedents and performance, strategic fit versus opportunism, network theory on niche marketing, born-“glocal” strategies, disruptive technologies, and discourse variables, for the future of SME export success.

2023

Analysing and Modeling Customer Success in Digital Marketing

Autores
César, I; Pereira, I; Madureira, A; Coelho, D; Rebelo Â, M; de Oliveira, DA;

Publicação
Lecture Notes in Networks and Systems

Abstract
Digital Marketing sets a sequence of strategies responsible for maximizing the interaction between companies and their target audience. One of them, known as Customer Success, establishes long-term techniques capable of projecting the sustainable value of a given customer to a company, monitoring the indexers that translate its activities. Therefore, this paper intends to address the need to develop an innovative tool that allows the creation of a temporal knowledge base composed of the behavioral evolution of customers. The CRISP-DM model benefits the processing and modeling of data capable of generating knowledge through the application and combination of the results obtained by machine learning algorithms specialized in time series. Time Series K-Means allows the clustering and differentiation of consumers characterized by their similar habits. Through the formulation of profiles, it is possible to apply forecasting methods that predict the following trends. The proposed solution provides the understanding of time series that profile the flow of customer activity and the use of the evidenced dynamics for the future prediction of these behaviors. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

2023

Studying the Impact of Sampling in Highly Frequent Time Series

Autores
Ferreira, PJS; Mendes-Moreira, J; Rodrigues, A;

Publicação
PROGRESS IN ARTIFICIAL INTELLIGENCE, EPIA 2023, PT I

Abstract
Nowadays, all kinds of sensors generate data, and more metrics are being measured. These large quantities of data are stored in large data centers and used to create datasets to train Machine Learning algorithms for most different areas. However, processing that data and training the Machine Learning algorithms require more time, and storing all the data requires more space, creating a Big Data problem. In this paper, we propose simple techniques for reducing large time series datasets into smaller versions without compromising the forecasting capability of the generated model and, simultaneously, reducing the time needed to train the models and the space required to store the reduced sets. We tested the proposed approach in three public and one private dataset containing time series with different characteristics. The results show, for the datasets studied that it is possible to use reduced sets to train the algorithms without affecting the forecasting capability of their models. This approach is more efficient for datasets with higher frequencies and larger seasonalities. With the reduced sets, we obtain decreases in the training time between 40 and 94% and between 46 and 65% for the memory needed to store the reduced sets.

2023

A Year Embedded in the Crypto-NFT Space

Autores
Baquero, C;

Publicação
COMMUNICATIONS OF THE ACM

Abstract

2023

Skynet: a Cyber-Aware Intrusion Tolerant Overseer

Autores
Freitas, T; Soares, J; Correia, ME; Martins, R;

Publicação
2023 53RD ANNUAL IEEE/IFIP INTERNATIONAL CONFERENCE ON DEPENDABLE SYSTEMS AND NETWORKS - SUPPLEMENTAL VOLUME, DSN-S

Abstract
The increasing level of sophistication of cyber attacks which are employing cross-cutting strategies that leverage multi-domain attack surfaces, including but not limited to, software defined networking poisoning, biasing of machine learning models to suppress detection, exploiting software (development), and leveraging system design deficiencies. While current defensive solutions exist, they only partially address multi-domain and multi-stage attacks, thus rendering them ineffective to counter the upcoming generation of attacks. More specifically, we argue that a disruption is needed to approach separated knowledge domains, namely Intrusion Tolerant systems, cybersecurity, and machine learning. We argue that current solutions tend to address different concerns/facets of overlapping issues and they tend to make strong assumptions of supporting infrastructure, e.g., assuming that event probes/metrics are not compromised. To address these issues, we present Skynet, a platform that acts as a secure overseer that merges traditional roles of SIEMs with conventional orchestrators while being rooted on the fundamentals introduced by previous generations of intrusion tolerant systems. Our goal is to provide an open-source intrusion tolerant platform that can dynamically adapt to known and unknown security threats in order to reduce potential vulnerability windows.

2023

Broadband spectral verification of optical clearing reversibility in lung tissue

Autores
Oliveira, LR; Ferreira, RM; Pinheiro, MR; Silva, HF; Tuchin, VV; Oliveira, LM;

Publicação
JOURNAL OF BIOPHOTONICS

Abstract
The increase of tissue transparency through sequential optical immersion clearing treatments and treatment reversibility have high interest for clinical applications. To evaluate the clearing reversibility in a broad spectral range and the magnitude of the transparency created by a second treatment, the present study consisted on measuring the spectral collimated transmittance of lung tissues during a sequence of two treatments with electronic cigarette (e-cig) fluid, which was intercalated with an immersion in saline. The saline immersion clearly reverted the clearing effect in the lung tissue in the spectral range between 220 and 1000 nm. By a later application of a second treatment with the e-cig fluid, the magnitude of the optical clearing effect was observed to be about the double as the one observed in the first treatment, showing that the molecules of the optical clearing agent might have converted some bound water into mobile water during the first treatment.

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