330 documents found, page 1 of 33
A collaborative multi-objective approach for clustering task based on distance ...
Azevedo, Beatriz Flamia; Rocha, Ana Maria A. C.; Pereira, Ana I.First Online: 28 December 2023; Clustering algorithm has the task of classifying a set of elements so that the elements within the same group are as similar as possible and, in the same way, that the elements of different groups (clusters) are as different as possible. This paper presents the Multi-objective Clustering Algorithm (MCA) combined with the NSGA-II, based on two intra- and three inter-clustering mea...
Hybrid approaches to optimization and machine learning methods: a systematic li...
Azevedo, Beatriz Flamia; Rocha, Ana Maria A. C.; Pereira, Ana I.Notably, real problems are increasingly complex and require sophisticated models and algorithms capable of quickly dealing with large data sets and finding optimal solutions. However, there is no perfect method or algorithm; all of them have some limitations that can be mitigated or eliminated by combining the skills of different methodologies. In this way, it is expected to develop hybrid algorithms that can t...
Accessibility strategies to promote inclusive mobility through multi-objective ...
Silva, Tânia; Verde, David; Paiva, Sara; Barreto, Luis; Pereira, Ana I.In recent decades, urban mobility has assumed a need for adaptation due to the more significant congestion experienced in cities and the growing focus on sustainability. Several solutions are proposed to help citizens move around in an urban environment. Most are not yet aware of the universal and accessible aspect that these solutions must have. This paper proposes a route support system embedded in a mobile a...
Cooperative heterogeneous robots for autonomous insects trap monitoring system ...
Berger, Guido; Teixeira, Marco; Cantieri, Álvaro R.; Lima, José; Pereira, Ana I.; Valente, António; Castro, Gabriel G.R.; Pinto, Milena F.The recent advances in precision agriculture are due to the emergence of modern robotics systems. For instance, unmanned aerial systems (UASs) give new possibilities that advance the solution of existing problems in this area in many different aspects. The reason is due to these platforms’ ability to perform activities at varying levels of complexity. Therefore, this research presents a multiple-cooperative rob...
Capacitated waste collection problem solution using an open-source tool
Silva, Adriano S.; Alves, Filipe; Díaz de Tuesta, Jose Luis; Rocha, Ana Maria A.C.; Pereira, Ana I.; Silva, Adrián; Gomes, HelderPopulation in cities is growing worldwide, which puts the systems that offer basic services to citizens under pressure. Among these systems, the Municipal Solid Waste Management System (MSWMS) is also affected. Waste collection and transportation is the first task in an MSWMS, carried out traditionally in most cases. This approach leads to inefficient resource and time expense since routes are prescheduled or d...
Combined optimization and regression machine learning for solar Irradiation and...
Amoura, Yahia; Torres, Santiago; Lima, José; Pereira, Ana I.Prediction of solar irradiation and wind speed are essential for enhancing the renewable energy integration into the existing power system grids. However, the deficiencies caused to the network operations provided by their intermittent effects need to be investigated. Regarding reserves management, regulation, scheduling, and dispatching, the intermittency in power output become a challenge for the system opera...
Node assembly for waste level measurement: embrace the smart city
Silva, Adriano S.; Brito, Thadeu; Díaz de Tuesta, Jose Luis; Lima, José; Pereira, Ana I.; Silva, Adrián; Gomes, HelderMunicipal Solid Waste Management Systems (MSWMS) worldwide are currently facing pressure due to the rapid growth of the population in cities. One of the biggest challenges in this system is the inefficient expenditure of time and fuel in waste collection. In this regard, cities/- municipalities in charge of MSWMS could take advantage of information and communication technologies to improve the overall quality o...
Volume estimation of an indoor space with LiDAR scanner
Bierende, Jaqueline; Braun, João; Lima, José; Pereira, Ana I.Three-dimensional scanning is a task of great importance for our modern society and has brought great advance when it comes to precision of inventory. These sensors measure and map the material surface continuously, allowing real-time inventory monitoring. As this process is very complex, most technologies are expensive, and even low-cost ones are a good investment option for the average user. Therefore, this w...
A hybrid approach to operational planning in home health care
Alves, Filipe; Duarte, António; Rocha, Ana Maria A.C.; Pereira, Ana I.; Leitão, PauloHome health care (HHC) management needs to plan their operations to synchronize professionals and allocate resources to perform several HHC services needed by patients. The growing demand for this type of service dictates the interest of all the stakeholders (professionalsand patients) in finding high-quality daily solutions and logistics. Routing and scheduling are problems of combinatorial nature, extremely c...
Sensor architecture model for unmanned aerial vehicles dedicated to electrical ...
Berger, Guido; Braun, João; Oliveira Júnior, Alexandre de; Lima, José; Pereira, Ana I.; Valente, António; Soares, Salviano; Rech, Lucas C.This research proposes positioning obstacle detection sensors by multirotor unmanned aerial vehicles (UAVs) dedicated to detailed inspections in high voltage towers. Different obstacle detection sensors are analyzed to compose a multisensory architecture in a multirotor UAV. The representation of the beam pattern of the sensors is modeled in the CoppeliaSim simulator to analyze the sensors’ coverage and detecti...