9 results on '"Tânia Rodrigues"'
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2. Assessing and improving management practices when planning packaging waste collection systems
- Author
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Ramos, Tânia Rodrigues Pereira, Gomes, Maria Isabel, and Barbosa-Póvoa, Ana Paula
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- 2014
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3. Effectiveness of extended producer responsibility policies implementation: The case of Portuguese and Spanish packaging waste systems.
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Rubio, Sergio, Ramos, Tânia Rodrigues Pereira, Leitão, Manuel Maria Rodrigues, and Barbosa-Povoa, Ana Paula
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PACKAGING waste , *EXTENDED producer responsibility programs , *WASTE management , *SUSTAINABLE development , *ECONOMIC development - Abstract
Abstract European countries are attempting to promote sustainable development by transitioning from a linear to a circular economy, where waste is to be prevented and recycling activities are promoted. This paper studies the implementation of Extended Producer Responsibility (EPR) policies for the packaging waste in two later European adopter countries of waste management policies: Portugal and Spain. The main goal is to evaluate whether EPR policies in both countries have achieved their basic two goals: 1) reduction of waste, and 2) increase recycling activities. Two case-studies were built based on interviews made to main waste management stakeholders. The analysis shows that the implementation of the EPR policies have had a positive impact throughout the years in both countries. Regarding the waste reduction goal, the systems have still not been completely able to detach packaging waste production from economic growth, but they have been able to promote material usage reduction directly through the Green dot fee model adopted. Regarding the increasing of recycling activities, both countries have been able to increase such rates throughout the years, in the direction of the EU targets. Highlights • EPR policies implemented in Spain and Portugal are evaluated. • EPR policies have contributed to packaging waste reduction and increase recycling activities. • EPR policies are having a positive impact throughout the years in both countries. • Some challenges still need to be faced: eco-design promotion and packaging life-cycle. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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4. A new hybrid distribution paradigm: Integrating drones in medicines delivery.
- Author
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Ramos, Tânia Rodrigues Pereira and Vigo, Daniele
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DRONE aircraft , *DRONE aircraft delivery , *VEHICLE routing problem , *CARBON emissions , *DELIVERY of goods - Abstract
This paper analyses a new hybrid paradigm resulting from the integration of unmanned aerial vehicles (UAV), commonly referred to as drones, in logistics and distribution processes. This work is motivated by a real application, where the company Connect Robotics, the first drone delivery provider in Portugal, made a partnership with a pharmacy located at a rural region to start implementing the delivery of medicines by drone. The pharmacy receives orders throughout the day and has to deliver in the same day with tight lead-times. The resulting problem is modelled as a Dynamic Parallel Drone Scheduling Vehicle Routing Problem with Lead-Time. A solution method is devised to solve it, thus helping the pharmacist to plan the car and drone delivery routes during the day. The results obtained on real instances revealed that the solution method is effective when compared to the optimal solutions of the static version of the problem, since the dynamic solution only differs, on average, about 7% from the static one. Moreover, some managerial insights about the impact of adding drones to the distribution operation are discussed, namely the economic and environmental impacts with cost savings up to 41% and reduction of monthly CO 2 emissions of 310 kg, the use of spare batteries which increase the benefit from 16% to 41%, and same-day versus next-day delivery. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
5. The smart waste collection routing problem: Alternative operational management approaches.
- Author
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Ramos, Tânia Rodrigues Pereira, de Morais, Carolina Soares, and Barbosa-Póvoa, Ana Paula
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REAL-time control , *TRANSPORTATION costs , *OPERATIONS management , *INDUSTRIAL management , *OPERATIONALISM - Abstract
Waste collection is nowadays an increasingly important business. However, it is often an inefficient operation due to the high uncertainty associated with the real waste bins’ fill-levels. To deal with such uncertainty the use of sensors to transmit real time information is seen as possible solution. But, in order to improve operations’ efficiency, the sensors’ usage must be combined with optimization procedures that inform on the optimal collection routes to operationalize, so as to guarantee a maximization of the waste collected while also minimizing transportation costs. The present work explores this challenge and studies three operational management approaches to define dynamic optimal routes, considering the access to real-time information on the bins’ fill-levels. A real case study is solved and important results were found where significant profit improvements are observed when compared to the real operation. This shows the potential of the proposed approaches to build an expert system, which can support the operations manager's decisions. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
6. Home care routing and scheduling problem with teams' synchronization.
- Author
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de Aguiar, Ana Raquel Pena, Ramos, Tânia Rodrigues Pereira, and Gomes, Maria Isabel
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HOME care services , *PERSONNEL management , *CAREGIVERS , *SERVICES for caregivers , *SYNCHRONIZATION , *PATIENT autonomy , *CONTINUUM of care - Abstract
The demand for home care (HC) services has steadily been growing for two main types of services: healthcare and social care. If, for the former, caregivers' skills are of utter importance, in the latter caregivers are not distinguishable in terms of skills. This work focuses social care and models caregivers' synchronization as a means of improving human resources management. Moreover, in social care services, several visits need to be performed in the same day since patients are frequently alone and need assistance throughout the day. Depending on the patient's autonomy, some tasks have to be performed by two caregivers (e.g. assist bedridden patients). Therefore, adequate decision support tools are crucial for assisting managers (often social workers) when designing operational plans and to efficiently assign caregivers to tasks. This paper advances the literature by 1) considering teams of one caregiver that can synchronize to perform tasks requiring two caregivers (instead of having teams of two caregivers), 2) simultaneously modelling daily continuity of care and teams' synchronization, and 3) associating dynamic time windows to teams' synchronizations introducing scheduling flexibility while minimize service and travel times. These concepts are embedded into a daily routing and scheduling MIP model, deciding on the number of caregivers and on the number and type of teams to serve all patient tasks. The main HC features of the problem, synchronization and continuity of care, are evaluated by comparing the proposed planning with the current situation of a home social care service provider in Portugal. The results show that synchronization is the feature that most increases efficiency with respect to the current situation. It evidences a surplus in working time capacity by proposing plans where all requests can be served with a smaller number of caregivers. Consequently, new patients from long waiting lists can now be served by the "available" caregivers. • A new Home Social Care Routing & Scheduling optimization model is proposed. • Teams' synchronization is explored as a means to improve HR management. • Simultaneously modelling of daily continuity of care and teams' synchronization. • Dynamic time windows are introduced to enhance routing flexibility. • A real home care case study is solved freeing 2 caregivers to accept more requests. [ABSTRACT FROM AUTHOR]
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- 2023
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7. Economic and environmental concerns in planning recyclable waste collection systems.
- Author
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Ramos, Tânia Rodrigues Pereira, Gomes, Maria Isabel, and Barbosa-Póvoa, Ana Paula
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CARBON dioxide mitigation , *GREENHOUSE gas mitigation , *WASTE recycling & economics , *RECYCLING & the environment , *VEHICLE routing problem , *STRATEGIC planning , *QUALITY of service - Abstract
Highlights: [•] A problem not yet addressed in the literature is studied-the multi-product, MDVRP. [•] Economic and environmental concerns are taken into account. [•] The problem was model through a MILP formulation with two objective functions. [•] An effective decomposition solution method is developed. [•] The model is applied to the solution of a real case resulting in significant savings. [ABSTRACT FROM AUTHOR]
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- 2014
- Full Text
- View/download PDF
8. Planning waste cooking oil collection systems.
- Author
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Ramos, Tânia Rodrigues Pereira, Gomes, Maria Isabel, and Barbosa-Póvoa, Ana Paula
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WASTE recycling , *FATS & oils , *BINS , *MIXED integer linear programming , *COST analysis , *ENERGY storage , *COOKING - Abstract
Highlights: [•] A waste cooking oil system is studied where the collection routes are planned. [•] A special routing feature that characterizes the cooking oil bins collection is addressed. [•] A problem not yet addressed in the literature is studied–the MDVRP with Mixed Closed and Open Routes. [•] A MILP formulation with capacity and time duration constraints is developed. [•] The model solves a real waste oil collection system resulting in 11% cost savings. [Copyright &y& Elsevier]
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- 2013
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9. A time-driven simulation–optimization framework for the dynamic heterogeneous order-courier assignment problem for instant deliveries.
- Author
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Jorge, Diana, Rocha, Tomás, and Ramos, Tânia Rodrigues Pereira
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ASSIGNMENT problems (Programming) , *DECISION support systems , *TRAFFIC congestion , *INTEGER programming , *SPEED limits , *EXPRESS service (Delivery of goods) - Abstract
• A time-driven simulation–optimization framework is developed for instant deliveries. • Simulation is applied to represent the entire system. • Optimization is applied to achieve the optimal assignment of couriers to orders. • The assignment problem is extended to address order-courier restrictions. • Effectiveness is demonstrated on literature instances and a realistic case study. In recent years, instant delivery services have become very popular for transporting meals to urban areas, with an extensive range of products now available to order. The platforms that offer these services rely on crowdsourced couriers who utilize their personal vehicles, resulting in heterogeneous fleets. Furthermore, the competition among companies to retain both customers and couriers is very intense, which underscores the importance of developing superior decision support systems. These systems must generate real-time assignments that meet the expectations of service providers, customers, and couriers. In this study, we designed a time-driven simulation–optimization framework that addresses the dynamic heterogeneous order-courier assignment problem and incorporates order-vehicle restrictions. The framework efficiently manages real-time order arrivals, courier movements, and positional updates while considering dynamic factors such as traffic congestion and regional speed limits for various vehicle types. Extensive testing using literature instances demonstrated the framework's ability to satisfactorily address the defined problem. Additionally, the time-driven simulation–optimization framework was applied to a realistic case study, resulting in an approximately 4.5% reduction in the total delivery times (from the submission of the order until the delivery to the client) for all orders when compared to the original assignment. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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