2022
Autores
Teixeira, S; Barbosa, B; Ferreira, C; Reis, JL;
Publicação
MARKETING AND SMART TECHNOLOGIES, VOL 1
Abstract
This article aims to identify the success factors for Website strategies of independent luxury fashion designers to communicate their brands and to foster lasting relationships with customers. The article includes an empirical study with 14 Portuguese luxury fashion brands designers that combine Website analysis and interviews with its managers. This study evidences the difficulties that Portuguese luxury fashion designers face in communicating the differentiating elements of a luxury fashion brand in digital channels, particularly product characteristics, luxury atmosphere, service personalisation, and the intimacy enabled by brick-and-mortar stores. The findings highlight the difficulties in strengthening online customer relationships, and those omnichannel strategies are essential to preserving luxury products' differentiating features and elements.
2022
Autores
Allahham M.S.; Abdellatif A.A.; Mhaisen N.; Mohamed A.; Erbad A.; Guizani M.;
Publicação
IEEE Transactions on Cognitive Communications and Networking
Abstract
The rapid production of mobile devices along with the wireless applications boom is continuing to evolve daily. This motivates the exploitation of wireless spectrum using multiple Radio Access Technologies (multi-RAT) and developing innovative network selection techniques to cope with such intensive demand while improving Quality of Service (QoS). Thus, we propose a distributed framework for dynamic network selection at the edge level, and resource allocation at the Radio Access Network (RAN) level, while taking into consideration diverse applications' characteristics. In particular, our framework employs a deep Multi-Agent Reinforcement Learning (DMARL) algorithm, that aims to maximize the edge nodes' quality of experience while extending the battery lifetime of the nodes and leveraging adaptive compression schemes. Indeed, our framework enables data transfer from the network's edge nodes, with multi-RAT capabilities, to the cloud in a cost and energy-efficient manner, while maintaining QoS requirements of different supported applications. Our results depict that our solution outperforms state-of-the-art techniques of network selection in terms of energy consumption, latency, and cost.
2022
Autores
Brito, M; Bernardo, F; Neves, MG; Neves, DRCB; Crespo, AJC; Dominguez, JM;
Publicação
JOURNAL OF MARINE SCIENCE AND ENGINEERING
Abstract
A 2D numerical investigation of the power absorption of a constrained wave energy hyperbaric converter (WEHC) under full-scale sea wave conditions is presented. A fully non-linear numerical model DualSPHysics, based on the coupling of a smoothed particle hydrodynamics (SPH) fluid solver with a multibody dynamics solver, is used to model the interaction between wave and WEHC sub-systems. The numerical model was first validated against experimental data for a similar device, with a good accordance between PTO position and velocity. The model is then employed to study the hydrodynamics of a constrained WEHC considering several sea states, different hydraulic power take-off (PTO) damping and breakwater geometries. It is observed that the capture width ratio (CWR) is particularly sensitive to variations in the PTO damping, although the CWR absolute maximum is less sensitive considering mild variations applied to the PTO damping. Both wave height and wave period have an important effect on the CWR. The breakwater geometry is also essential for the performance of the WEHC, with a decrease in maximum CWR of about 15% for porous breakwater. These results are necessary to understand the full-scale behaviour of WEHC.
2022
Autores
Pires, M; Couto, P; Santos, A; Filipe, V;
Publicação
MACHINES
Abstract
Autonomous driving is one of the fastest developing fields of robotics. With the ever-growing interest in autonomous driving, the ability to provide robots with both efficient and safe navigation capabilities is of paramount significance. With the continuous development of automation technology, higher levels of autonomous driving can be achieved with vision-based methodologies. Moreover, materials handling in industrial assembly lines can be performed efficiently using automated guided vehicles (AGVs). However, the visual perception of industrial environments is complex due to the existence of many obstacles in pre-defined routes. With the INDTECH 4.0 project, we aim to develop an autonomous navigation system, allowing the AGV to detect and avoid obstacles based in the processing of depth data acquired with a frontal depth camera mounted on the AGV. Applying the RANSAC (random sample consensus) and Euclidean clustering algorithms to the 3D point clouds captured by the camera, we can isolate obstacles from the ground plane and separate them into clusters. The clusters give information about the location of obstacles with respect to the AGV position. In experiments conducted outdoors and indoors, the results revealed that the method is very effective, returning high percentages of detection for most tests.
2022
Autores
Souza, MEB; Teixeira, JG; Pacheco, AP;
Publicação
Advances in Forest Fire Research 2022
Abstract
2022
Autores
Nogueira, AR; Ferreira, CA; Gama, J;
Publicação
PROGRESS IN ARTIFICIAL INTELLIGENCE
Abstract
Typically, classification algorithms use correlation analysis to make decisions. However, these decisions and the models they learn are not easily understandable for the typical user. Causal discovery is the field that studies the means to find causal relationships in observational data. Although highly interpretable, causal discovery algorithms tend to not perform so well in classification problems. This paper aims to propose a hybrid decision tree approach (SC tree) that mixes causal discovery with correlation analysis through the implementation of a custom metric to split the data in the tree's construction (Semi-causal gain ratio). In the results, the proposed methodology obtained a significant performance improvement (11.26% mean error rate) when compared to several causal baselines CDT-PS (23.67% ) and CDT-SPS (25.14%), matching closely the performance of J48 (10.20%), used as a correlation baseline, in ten binary data sets. Besides, when compared with PC in discrete data sets, the proposed approach obtained substantial improvement (16.17% against 28.07% in terms of mean error rate).
The access to the final selection minute is only available to applicants.
Please check the confirmation e-mail of your application to obtain the access code.