2025
Authors
Soares, R; Parragh, SN; Marques, A; Amorim, P;
Publication
NETWORKS
Abstract
The Vehicle Routing Problem with Synchronization (VRPSync) aims to minimise the total routing costs while considering synchronization requirements that must be fulfilled between tasks of different routes. These synchronization requirements are especially relevant when it is necessary to have tasks being performed by vehicles within given temporal offsets, a frequent requirement in applications where multiple vehicles, crews, materials, or other resources are involved in certain operations. Although several works in the literature have addressed this problem, mainly the deterministic version has been tackled so far. This paper presents a robust optimization approach for the VRPSync, taking into consideration the uncertainty in vehicle travel times between customers. This work builds on existing approaches in the literature to develop mathematical models for the Robust VRPSync, as well as a branch-and-cut algorithm to solve more difficult problem instances. A set of computational experiments is also devised and presented to obtain insights regarding key performance parameters of the mathematical models and the solution algorithm. The results suggest that solution strategies where certain standard problem constraints are only introduced if a candidate solution violates any of those constraints provide more consistent improvements than approaches that rely on tailor-made cutting planes, added through separation routines. Furthermore, the analysis of the Price of Robustness indicators shows that the adoption of robust solutions can have a significant increase in the total costs, however, this increase quickly plateaus as budgets of uncertainty increase.
2025
Authors
Chaves, R; Barbosa, CE; de Oliveira, GA; Oliveira Lyra, AD; Argôlo, MM; Salazar, H; Lima, Y; Schneider, D; Correia, A; de Souza, JM;
Publication
AI Soc.
Abstract
2025
Authors
Adão, R; Wu, Z; Zhou, C; Balmau, O; Paulo, J; Macedo, R;
Publication
CoRR
Abstract
2025
Authors
Rodrigues, C; Correia, M; Abrantes, J; Rodrigues, M; Nadal, J;
Publication
2025 IEEE 8TH PORTUGUESE MEETING ON BIOENGINEERING, ENBENG
Abstract
This study presents and applies validation of whole-body (WB) center of mass (COM) dynamics during impulse phase of explosive maximum vertical jumps (MVJ) using a low-cost image system and 3D anatomical kinematics based on direct linear transformation of 2D image. Root mean square error (RMSE) and squared error analysis led to detection of specific behavior at different MVJ impulse phases with application on kinematic validation of WB COM displacement from dynamics, coping with the limitations of the time flight method and WB weight for vertical impulse and contributing for accurate assessment of lower limb muscle force.
2025
Authors
Cassola, F; Cavaleiro, V; Lacet, D; Correia, M; Oliveira, MA; de Carvalho, AV; Morgado, L;
Publication
OCEANS 2025 BREST
Abstract
Digital Twins (DTs) for the ocean are rapidly emerging as essential tools for understanding, forecasting, and managing environmental phenomena. However, most existing DT visualization solutions are tightly coupled to specific platforms and lack semantic coherence and interoperability-challenges that are particularly critical in federated and distributed DT systems. Furthermore, visualizing dynamic and spatio-temporal behaviors, such as oil spills, across multiple rendering environments remains a complex, platform-dependent task. In this paper, we present VChor, a domain-agnostic virtual choreography framework designed to address these limitations. Our approach integrates model-driven engineering, semantic web technologies, and platform-independent representations to support the declarative specification of behaviors and visual mappings. A single VChor instance describes spatio-temporal dynamics and associated actions, and can be interpreted by multiple visualization engines (e.g., Unity3D and CesiumJS) without the need for code recompilation or platform-specific programming. We demonstrate our approach through a real-world oil spill monitoring use case, developed in the context of the ILIAD H2020 project, and encapsulated within a modular Application Package. This package automates the generation, validation, and transformation of virtual choreographies from raw data to platform-specific outputs. The framework promotes interoperability, reusability, and scalability, while supporting FAIR principles in environmental Digital Twin workflows. The findings highlight VChor's potential to streamline scenario modeling, enable cross-platform visualization, and support decision-makers with accurate, flexible, and reusable visual representations of ocean dynamics.
2025
Authors
Silva, A; Mamede, HS; Santos, V; Santos, A; Silveira, C;
Publication
MARKETING AND SMART TECHNOLOGIES, ICMARKTECH 2024, VOL 1
Abstract
Numerous Robotic Process Automation (RPA) market solutions with wildly disparate capabilities and business models are being put forth. RPA is still in its infancy, and its technology framework is continually evolving. There are very few comparative studies of RPA systems, and they do not make it simple to tailor the solution to the needs of the business choosing it. Thus, the research question is that it feasible to design a procedure that enables the choice of the most appropriate RPA tool while accounting for a particular business domain, reality, and set of requirements? In order to accomplish this, this study builds an artifact that comprises a collection of indicators to enable the long-term selection of the best RPA solution for each organization and/or business process using the methodological approach of Design Science Research. The artifact offers a methodology to categorize the level of adaptability of each solution for automating business processes, performs a comparative analysis of existing RPA solutions using a particular framework, and provides an overview of the features of currently available solutions on the market. The viability of the artifact is demonstrated using a real-world case situation. This test demonstrated the artifact's capacity to meet the goals.
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