Industrial and Systems Engineering

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Browsing Industrial and Systems Engineering by Title

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    2012 Survey of Portuguese TTOs
    ( 2012) Aurora Teixeira ; J. Jarrett
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    2DCPackGen: A problem generator for two-dimensional rectangular cutting and packing problems
    ( 2014) Elsa Marília Silva ; José Fernando Oliveira ; Waescher,G
    Cutting and packing problems have been extensively studied in the literature in recent decades, mainly due to their numerous real-world applications while at the same time exhibiting intrinsic computational complexity. However, a major limitation has been the lack of problem generators that can be widely and commonly used by all researchers in their computational experiments. In this paper, a problem generator for every type of two-dimensional rectangular cutting and packing problems is proposed. The problems are defined according to the recent typology for cutting and packing problems proposed by Wascher, Haussner, and Schumann (2007) and the relevant problem parameters are identified. The proposed problem generator can significantly contribute to the quality of the computational experiments run with cutting and packing problems and therefore will help improve the quality of the papers published in this field.
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    3 DoF/6 DoF Localization System for Low Computing Power Mobile Robot Platforms
    ( 2015) Carlos Miguel Costa ; Héber Miguel Sobreira ; Armando Sousa ; Germano Veiga
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    3-D Position Estimation from Inertial Sensing: Minimizing the Error from the Process of Double Integration of Accelerations
    ( 2013) Neto,P ; Norberto Pires,JN ; António Paulo Moreira
    This paper introduces a new approach to 3-D position estimation from acceleration data, i.e., a 3-D motion tracking system having a small size and low-cost magnetic and inertial measurement unit (MIMU) composed by both a digital compass and a gyroscope as interaction technology. A major challenge is to minimize the error caused by the process of double integration of accelerations due to motion (these ones have to be separated from the accelerations due to gravity). Owing to drift error, position estimation cannot be performed with adequate accuracy for periods longer than few seconds. For this reason, we propose a method to detect motion stops and only integrate accelerations in moments of effective hand motion during the demonstration process. The proposed system is validated and evaluated with experiments reporting a common daily life pick-and-place task.
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    Academic Misconduct in Portugal: Results from a Large Scale Survey to University Economics/Business Students
    ( 2010) Aurora Teixeira ; Maria de Fátima Rocha
    The phenomenon of cheating in higher education is of overwhelming importance in that the students engaging in these acts are unlikely to have the skills necessary for their future professional life. Despite its relevance, the empirical evaluation of cheating in universities has been almost exclusively focused on the US context. Little is known about cheating at the European level, let alone in Portugal. Even less is explored at the regional level. In this paper we present evidence on the perception of cheating by Portuguese undergraduate students of economics/business degrees. We undertake a large-scale survey, involving 2675 students from all Portuguese mainland public universities (10). We found that copying-favourable environments are associated with a higher propensity to cheat. Moreover, in universities where 'codes of honour' exist, this propensity tends to be lower. Finally, the propensity to copy seems to be highly influenced by the cultural systems and socially-related factors of different regions.
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    Accessibility levels of Portuguese enterprise websites: equal opportunities for all?
    ( 2012) Manuel Au-Yong Oliveira ; José Martins ; Jorge Pereira ; João José Ferreira ; Ramiro Gonçalves
    Web accessibility is growing in importance. We may also find an increasing need for access to web resources by those with some sort of disability. The Web is very important for spreading information and for promoting interaction between the various elements in society. Given this, it is essential that the Web presents itself as a totally accessible resource, so that it can help citizens with disabilities and their integration in society. This obligation should be even greater for enterprises as primarily the Web is used as a marketing and business platform. With this document, we present indicators regarding the [lack of] accessibility levels of Portuguese enterprise websites. This article contains theoretical and background considerations as well as the results of two different studies that the research team undertook. First of all, the research team made a comparison between the 1000 largest Portuguese enterprises (annual sales volume) and the 1000 best Portuguese small and medium enterprises (sales growth and profit) using a specialised software tool and according to Web Content Accessibility Guidelines (WCAG) 1.0; the research team then also considered WCAG 2.0 and its impact on enterprise Web accessibility. In the second study (qualitative in nature), focus group interactions led to a set of recommendations towards greater accessibility.
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    Accuracy versus Complexity of MARG-based Filters for Remote Control Pointing Devices
    ( 2015) Rasteiro,M ; Hugo Costelha ; Bento,L ; Assuncao,P ; 5759
    Although most current pointing devices rely on relative rotation increments, absolute orientation allows for a more intuitive interaction. However, this is difficult to implement in low-energy consumption devices since accurate fusion filters are computationally intensive. This work presents a comparative study of low-complexity filters and state-of-the-art orientation tracking systems, enabling to access complexity versus portability. A relevant set of different MARG units currently available on the market were studied under systematic tests and human subjective user analysis. Experimental results show that it is possible to obtain similar accuracy using low-complexity filters to the ones observed with state-of-the-art orientation tracking systems.
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    An adaptive large neighbourhood search for the operational integrated production and distribution problem of perishable products
    ( 2015) Belo Filho,MAF ; Pedro Amorim ; Bernardo Almada-Lobo
    Production and distribution problems with perishable goods are common in many industries. For the sake of the competitiveness of the companies, the supply chain planning of products with restricted lifespan should be addressed with an integrated approach. Particularly, at the operational level, the sizing and scheduling of production lots have to be decided together with vehicle routing decisions to satisfy the customers. However, such joint decisions make the problems hard to solve for industries with a large product portfolio. This paper proposes an adaptive large neighbourhood search (ALNS) framework to tackle the problem. This metaheuristic is well known to be effective for vehicle routing problems. The proposed approach relies on mixed-integer linear programming models and tools. The ALNS outperforms traditional procedures of the literature, namely, exact methods and fix-and-optimize, in terms of quality of the solution and computational time of the algorithms. Nine in ten runs of ALNS yielded better solutions than traditional procedures, outperforming on average 12.7% over the best solutions provided by the latter methods.
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    Adaptive Portfolio Optimization for Multiple Electricity Markets Participation
    ( 2016) Pinto,T ; Morais,H ; Sousa,TM ; Sousa,T ; Vale,Z ; Praca,I ; Faia,R ; Eduardo Pires
    The increase of distributed energy resources, mainly based on renewable sources, requires new solutions that are able to deal with this type of resources' particular characteristics (namely, the renewable energy sources intermittent nature). The smart grid concept is increasing its consensus as the most suitable solution to facilitate the small players' participation in electric power negotiations while improving energy efficiency. The opportunity for players' participation in multiple energy negotiation environments (smart grid negotiation in addition to the already implemented market types, such as day-ahead spot markets, balancing markets, intraday negotiations, bilateral contracts, forward and futures negotiations, and among other) requires players to take suitable decisions on whether to, and how to participate in each market type. This paper proposes a portfolio optimization methodology, which provides the best investment profile for a market player, considering different market opportunities. The amount of power that each supported player should negotiate in each available market type in order to maximize its profits, considers the prices that are expected to be achieved in each market, in different contexts. The price forecasts are performed using artificial neural networks, providing a specific database with the expected prices in the different market types, at each time. This database is then used as input by an evolutionary particle swarm optimization process, which originates the most advantage participation portfolio for the market player. The proposed approach is tested and validated with simulations performed in multiagent simulator of competitive electricity markets, using real electricity markets data from the Iberian operator-MIBEL.
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    AdaptPack studio translator: translating offline programming to real palletizing robots
    ( 2020) Silva,MF ; João Pedro Souza ; Castro,AL ; Luís Freitas Rocha ; 5364 ; 7366
    Purpose This paper aims to propose a translation library capable of generating robots proprietary code after their offline programming has been performed in a software application, named AdaptPack Studio, running over a robot simulation and offline programming software package. Design/methodology/approach The translation library, named AdaptPack Studio Translator, is capable to generate proprietary code for the Asea Brown Boveri, FANUC, Keller und Knappich Augsburg and Yaskawa Motoman robot brands, after their offline programming has been performed in the AdaptPack Studio application. Findings Simulation and real tests were performed showing an improvement in the creation, operation, modularity and flexibility of new robotic palletizing systems. In particular, it was verified that the time needed to perform these tasks significantly decreased. Practical implications The design and setup of robotics palletizing systems are facilitated by an intuitive offline programming system and by a simple export command to the real robot, independent of its brand. In this way, industrial solutions can be developed faster, in this way, making companies more competitive. Originality/value The effort to build a robotic palletizing system is reduced by an intuitive offline programming system (AdaptPack Studio) and the capability to export command to the real robot using the AdaptPack Studio Translator. As a result, companies have an increase in competitiveness with a fast design framework. Furthermore, and to the best of the author’s knowledge, there is also no scientific publication formalizing and describing how to build the translators for industrial robot simulation and offline programming software packages, being this a pioneer publication in this area.
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    AdaptPack Studio: an automated intelligent framework for offline factory programming
    ( 2020) João Pedro Souza ; Manuel Santos Silva ; Luís Freitas Rocha ; Castro,AL ; 5655 ; 7366 ; 5364
    Purpose This paper aims to propose an automated framework for agile development and simulation of robotic palletizing cells. An automatic offline programming tool, for a variety of robot brands, is also introduced. Design/methodology/approach This framework, named AdaptPack Studio, offers a custom-built library to assemble virtual models of palletizing cells, quick connect these models by drag and drop, and perform offline programming of robots and factory equipment in short steps. Findings Simulation and real tests performed showed an improvement in the design, development and operation of robotic palletizing systems. The AdaptPack Studio software was tested and evaluated in a pure simulation case and in a real-world scenario. Results have shown to be concise and accurate, with minor model displacement inaccuracies because of differences between the virtual and real models. Research limitations/implications An intuitive drag and drop layout modeling accelerates the design and setup of robotic palletizing cells and automatic offline generation of robot programs. Furthermore, A* based algorithms generate collision-free trajectories, discretized both in the robot joints space and in the Cartesian space. As a consequence, industrial solutions are available for production in record time, increasing the competitiveness of companies using this tool. Originality/value The AdaptPack Studio framework includes, on a single package, the possibility to program, simulate and generate the robot code for four different brands of robots. Furthermore, the application is tailored for palletizing applications and specifically includes the components (Building Blocks) of a particular company, which allows a very fast development of new solutions. Furthermore, with the inclusion of the Trajectory Planner, it is possible to automatically develop robot trajectories without collisions.
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    AdaptPack Studio: Automatic Offline Robot Programming Framework for Factory Environments
    ( 2019) João Pedro Souza ; Manuel Santos Silva ; Luís Freitas Rocha ; Castro,A ; 5655 ; 7366 ; 5364
    The brisk and dynamic environment that factories are facing, both as an internal and an external level, requires a collection of handy tools to solve emerging issues in the industry 4.0 context. Part of the common challenges that appear are related to the increasing demand for high adaptability in the organizations' production lines. Mechanical processes are becoming faster and more adjustable to the production diversity in the Fast Moving Consumer Goods (FMCG). Concerning the previous characteristics, future factories can only remain competitive and profitable if they have the ability to quickly adapt all their production resources in response to inconstant market demands. Having previous concerns in focus, this paper presents a fast and adaptative framework for automated cells modeling, simulation and offline robot programming, focused on palletizing operations. Established as an add-on for the Visual Components (VC) 3D manufacturing simulation software, the proposed application allows performing fast layout modeling and automatic offline generation of robot programs. Furthermore, A* based algorithms are used for generating collision-free trajectories, discretized both in the robot joints space and in the Cartesian space. The software evaluation was tested inside the VC simulation world and in the real-world scenario. Results have shown to be concise and accurate, with minor displacement inaccuracies due to differences between the virtual model and the real world. © 2019 IEEE.
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    Addressing trade-offs among fuel management scenarios through a dynamic and spatial integrated approach for enhanced decision-making in eucalyptus forest
    ( 2014) Botequim,B ; Ager,A ; Abilio Pereira Pacheco ; Oliveira,T ; João Claro ; Fernandes,PM ; Borges,JG
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    Adoption of digital technologies during the COVID-19 pandemic: Lessons learned from collaborative Academia-Industry R&D case studies
    ( 2021) Ana Cristina Simões ; Ferreira,F ; Hélio Cristiano Castro ; Pedro Senna ; Daniela Sofia Silva ; Gustavo Dalmarco ; 7330 ; 8340 ; 7161 ; 7376 ; 5521
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    An Advanced Agent-Based Order Planning System for Dynamic Networked Enterprises
    ( 2004) César Toscano ; Jorge Pinho de Sousa ; Américo Azevedo ; António Lucas Soares
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    Advanced Services for Supply Chain Design processes in Collaborative Networks
    ( 2012) Rosanna Fornasiero ; Eva A. Coscia ; Salvatore Piccione ; Domenico Rotondi ; João Bastos
    Design and production of small series for specific customer target groups in collaborative networks can help companies to increase their competitiveness. This paper aims to describe a new framework of services for collaborative networking for on-demand productions. After describing the business processes that need to be supported by innovative tools for partner search and collaborative production planning, we describe the developed services and how they are integrated to ease the communication between different activities.
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    An agent-based approach to schedule crane operations in rail-rail transshipment terminals
    ( 2016) Sam Heshmati ; Kokkinogenis,Z ; Rossetti,RJF ; Maria Antónia Carravilla ; José Fernando Oliveira
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    An agent-based simulation approach to the circular open dimension problem
    ( 2015) Ribeiro,JP ; Rossetti,RJF ; José Fernando Oliveira
    Cutting and packing problems generally address the cutting or packing of smaller items into a larger container object. Usually, the main methodologies used in the Circular Open Dimension Problem (CODP) are nonlinear programming methods or methods that combine different heuristics. The aim of this project is at devising and using an agent-based simulation approach to determine the length of the open rectangle in CODP; more specifically, we look into the Circular two-dimension Open Dimension Problem. Agents (circles, which can have different dimensions) were given a set of simple rules that allow them to be placed in the world (i.e. an open rectangle). These rules are inferred from the formal CODP formulation and from the behavior defined in the agents.
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    Airfoil Selection and Wingsail Design for an Autonomous Sailboat
    ( 2019) Benedita Malheiro ; Manuel Santos Silva ; Guedes,P ; Ferreira,P ; 5655 ; 5855