Papers by Leonilde Varela
Web-Based Decision System for Distributed Process Planning in a Networked Manufacturing Environment
Developments and Advances in Intelligent Systems and Applications, 2017
Distributed manufacturing sector is increasingly enabling the Web-enabled services due to the adv... more Distributed manufacturing sector is increasingly enabling the Web-enabled services due to the advancements in Information technology and pervasive applications of recently advanced manufacturing systems. In this paper, world wide web (WWW) collaborative model is developed, and architecture with the web enabled service system for effective integration of distributed process planning and scheduling is proposed to assists the geographically distributed enterprises located in the context of networked manufacturing for effective coordination and collaboration. To validate the feasibility of the proposed approach, a case study has been presented and found that the proposed method and developed tool offers some benefits such as high interoperability, openness, cost-efficiency, and production scalability.
Nowadays, companies are faced with an increasingly higher level of competition while trying to ad... more Nowadays, companies are faced with an increasingly higher level of competition while trying to adapt to the exigencies imposed by the Industry 4.0, regarding its usually referred dimensions and pillars, among which one that although is not so often referred is also expressing an increasing visibility and importance, related to collaboration, and more specifically to collaborative decision making and co-working. Thus, in this paper an analysis is carried out regarding the evolution of publications that have been put available over the last decade about collaborative decision making approaches, varying from approaches based on mathematical models up to the application of artificial intelligence and other kind of approaches. Moreover, a discussion about the relation between collaborative decision making, concurrent engineering and Industry 4.0 dimensions is also done.
E-commerce promotes economic growth by enabling online shops to compete within a global market sc... more E-commerce promotes economic growth by enabling online shops to compete within a global market scenario. There are critical success factors that permit to distinguish a good business on the Internet and this knowledge may allow reaching an important competitive advantage for business sustainability. As many disciplines are involved, when determining critical success factors, e-commerce requires an effective coordination and integration in a collaborative way. In e-commerce, as well as in any other ecosystem, the breaking down of some integrating elements may provoke a collapse on the whole system. The various stakeholders involved in a given business should, therefore, be involved and work together to achieve a high quality product that fully satisfies the end customer's needs and wishes. To meet the above requirement, this paper proposes a multi-perspective critical success factors (MPCSF) model for online shopping.
Web-Based Decision System for Distributed Process Planning in a Networked Manufacturing Environment
Developments and Advances in Intelligent Systems and Applications, 2017
Distributed manufacturing sector is increasingly enabling the Web-enabled services due to the adv... more Distributed manufacturing sector is increasingly enabling the Web-enabled services due to the advancements in Information technology and pervasive applications of recently advanced manufacturing systems. In this paper, world wide web (WWW) collaborative model is developed, and architecture with the web enabled service system for effective integration of distributed process planning and scheduling is proposed to assists the geographically distributed enterprises located in the context of networked manufacturing for effective coordination and collaboration. To validate the feasibility of the proposed approach, a case study has been presented and found that the proposed method and developed tool offers some benefits such as high interoperability, openness, cost-efficiency, and production scalability.
FME Transactions, 2021
Nowadays, companies are faced with an increasingly higher level of competition while trying to ad... more Nowadays, companies are faced with an increasingly higher level of competition while trying to adapt to the exigencies imposed by the Industry 4.0, regarding its usually referred dimensions and pillars, among which one that although is not so often referred is also expressing an increasing visibility and importance, related to collaboration, and more specifically to collaborative decision making and co-working. Thus, in this paper an analysis is carried out regarding the evolution of publications that have been put available over the last decade about collaborative decision making approaches, varying from approaches based on mathematical models up to the application of artificial intelligence and other kind of approaches. Moreover, a discussion about the relation between collaborative decision making, concurrent engineering and Industry 4.0 dimensions is also done.
Nowadays, companies are faced with an increasingly higher level of competition while trying to ad... more Nowadays, companies are faced with an increasingly higher level of competition while trying to adapt to the exigencies imposed by the Industry 4.0, regarding its usually referred dimensions and pillars, among which one that although is not so often referred is also expressing an increasing visibility and importance, related to collaboration, and more specifically to collaborative decision making and co-working. Thus, in this paper an analysis is carried out regarding the evolution of publications that have been put available over the last decade about collaborative decision making approaches, varying from approaches based on mathematical models up to the application of artificial intelligence and other kind of approaches. Moreover, a discussion about the relation between collaborative decision making, concurrent engineering and Industry 4.0 dimensions is also done.
E-commerce promotes economic growth by enabling online shops to compete within a global market sc... more E-commerce promotes economic growth by enabling online shops to compete within a global market scenario. There are critical success factors that permit to distinguish a good business on the Internet and this knowledge may allow reaching an important competitive advantage for business sustainability. As many disciplines are involved, when determining critical success factors, e-commerce requires an effective coordination and integration in a collaborative way. In e-commerce, as well as in any other ecosystem, the breaking down of some integrating elements may provoke a collapse on the whole system. The various stakeholders involved in a given business should, therefore, be involved and work together to achieve a high quality product that fully satisfies the end customer's needs and wishes. To meet the above requirement, this paper proposes a multi-perspective critical success factors (MPCSF) model for online shopping.
FME Transactions, 2021
Nowadays, companies are faced with an increasingly higher level of competition while trying to ad... more Nowadays, companies are faced with an increasingly higher level of competition while trying to adapt to the exigencies imposed by the Industry 4.0, regarding its usually referred dimensions and pillars, among which one that although is not so often referred is also expressing an increasing visibility and importance, related to collaboration, and more specifically to collaborative decision making and co-working. Thus, in this paper an analysis is carried out regarding the evolution of publications that have been put available over the last decade about collaborative decision making approaches, varying from approaches based on mathematical models up to the application of artificial intelligence and other kind of approaches. Moreover, a discussion about the relation between collaborative decision making, concurrent engineering and Industry 4.0 dimensions is also done.
Automatic Assist in Estimating the Production Capacity of Final Machining for Cast Iron Machine Parts
The paper presents a new approach for production capacities balancing. It is dedicated to compani... more The paper presents a new approach for production capacities balancing. It is dedicated to companies performing machining services on a variety of materials on a small scale. The method is to help balance the production capacity on the basis of a defined labor intensity structure taking into account the share of set-up times and the level of defectiveness. The designed numerical algorithms along with the user interface make it possible to characterize machine tools and orders in the production system and compare the production capabilities of the system with the demand. The paper presents the algorithm working pattern, mathematical formulae used and a sample source code. An example of a computer application allowing to estimate the production capacity for sample orders (cast iron castings) and process routes in a selected cast iron production plant are also presented.
2016 11th Iberian Conference on Information Systems and Technologies (CISTI), Jun 1, 2016
Meta-heuristics have been applied for a long time to the Travelling Salesman Problem (TSP) but in... more Meta-heuristics have been applied for a long time to the Travelling Salesman Problem (TSP) but information is still lacking in the determination of the parameters with the best performance. This paper examines the impact of the Simulated Annealing (SA) and Discrete Artificial Bee Colony (DABC) parameters in the TSP. One special consideration of this paper is how the Neighborhood Structure (NS) interact with the other parameters and impacts the performance of the meta-heuristics. NS performance has been the topic of much research, with NS proposed for the best-known problems, which seem to imply that the NS influences the performance of meta-heuristics, more that other parameters. Moreover, a comparative analysis of distinct meta-heuristics is carried out to demonstrate a non-proportional increase in the performance of the NS.
Advances in Intelligent and Soft Computing, 2011
Proceedings of the 3rd EAI International Conference on Management of Manufacturing Systems, 2018
Integrated process planning and scheduling in networked manufacturing systems plays a crucial rol... more Integrated process planning and scheduling in networked manufacturing systems plays a crucial role nowadays and in the forthcoming context of Industry 4.0 to enable effective and efficient decisions, and to improve the business market, based on collaboration, along with computer-based distributed manufacturing and management functions. In this paper some insights regarding a literature review carried out about this main subjects analysed are presented and discussed. Moreover, a framework for integrated process planning and scheduling in networked manufacturing systems is proposed and briefly described, along with some main underlying issues, which are further discussed.
Social network analysis (SNA) is a widely studied research topics, which has been increasingly be... more Social network analysis (SNA) is a widely studied research topics, which has been increasingly being applied for solving different kind of problems, including industrial manufacturing ones. This paper focuses on the application of SNA on an industrial plant layout problem. The study aims at analyzing the importance of using SNA techniques to analyze important relations between entities in a manufacturing environment, such as jobs and resources in the context of industrial plant layout analysis. The study carried out enabled to obtain relevant results for the identification of relations among these entities for supporting to establish an appropriate plant layout for producing the jobs.
Investigation of copper and zinc contamination on the work piece surface with WEDM
This work presents an investigation on Wire Electric Discharge Machining (WEDM) of Pure Titanium ... more This work presents an investigation on Wire Electric Discharge Machining (WEDM) of Pure Titanium (Grade-2). Pure Titanium and its alloys are the most suitable metallic materials for biomedical applications. In health care, they are used for implant devices like knee and hip implants, fixing materials for bones like nails and screws, and in the oral and maxillofacial surgery. Properties like good biocompatibility, high corrosion resistance, and high fracture strength make titanium parts the perfect solution for bio-implants. The more frequent use of the titanium necessitates an economical machining process. Conventional processes like milling, grinding or drilling have their limits because of the material’s mechanical properties which cause high tool wear. WEDM proves to be an alternative especially for manufacturing complex parts as there is no actual contact with tool and the work piece. Within this study, the capabilities of Wire-EDM for the manufacturing of clean surfaces with di...
Production Flow Improvement in a Textile Industry
Proceedings of the International Conference on Information Technology & Systems (ICITS 2018)
Enhance production flow in a Company is of prior importance, not just regarding the general funct... more Enhance production flow in a Company is of prior importance, not just regarding the general functioning of the underlying production system itself but also regarding all the more or less closely related issues, varying from the warehouse organization and materials handling and space management, to general productivity improvements to reach by a Company. In this paper is presented a case study regarding the analysis of production flow in a textile company in Portugal, and the main improvements proposals are exposed and briefly described.
-In the current marketplace, enterprises face enormous competitive pressures. Global competition ... more -In the current marketplace, enterprises face enormous competitive pressures. Global competition for customers that demand customized products with shorter due dates and the advancement in information technologies, marked the introduction of the Extended Enterprise. In these EMEs (Extended Manufacturing Environments), lean, virtual, networked and distributed enterprises, form MO (MetaOrganizations), which collaborate to respond to the dynamic marketplace. MO members share resources, customers and information. In this paper we present a hybrid framework based on a DKBS (Distributed Knowledge Base System), which includes information about scheduling methods for collaborative enterprises sharing their problems. A core component of this system includes an inference engine as well as two indexes, to help in the classification of the usefulness of the information about the problems and solving methods. A more structured approach for expanding the MO concept is presented, with the HO (Hype...
An Integrated Fuzzy MCDM Approach to Supplier Selection—Indian Automotive Industry Case
Robust Supply Chain Network Design Under Facility Disruption by Consideration of Risk Propagation
Innovations in Industrial Engineering, 2021
A supply chain consists of facilities that are subjected to various types of disruption. When one... more A supply chain consists of facilities that are subjected to various types of disruption. When one or more facility in the supply chain is disrupted, its impact propagates and reduce the performance of the supply chain. This research paper takes into consideration the probability of a disruption scenario to design a robust network for a supply chain. A stochastic mathematical formulation has been presented as a mixed-integer linear programming model for maximizing the concerned profit. For measuring the supply chain’s robustness, the final quantity delivered after risk propagation in the disruption scenario as a robustness index (RI) is utilized. A numerical simulation is conducted to calculate the robustness index at different linking intensity and node threshold. The robustness index is compared under different disruption scenarios to obtain the optimal combination concerning linking intensity and node threshold.
Lecture Notes in Mechanical Engineering, 2019
The domain of Production Planning and Control, or in a broader sence Production Management has be... more The domain of Production Planning and Control, or in a broader sence Production Management has been deserving a special and increasing attention by the companies, which intend to continuously achieve better results through continuous improvement, which also fits in the context of Industry 4.0. Companies tend to implement management systems with the purpose of achieving greater competitiveness and, consequently, greater sustainability in their sector. The selection of the appropriate production management system is a serious problem for the companies. The main objective of this study is to support companies in the correct choice of a Decision Support System. The method used to achieve the proposed objective consists on formulating a model for comparing functionalities and specifications, where selection of criteria were also defined and analyzed. Based on a large Company scenario, the model is applied to three production execution systems: SAP PP (Systems Applications and Products - ...
Job shop schedules analysis in the context of industry 4.0
2017 International Conference on Engineering, Technology and Innovation (ICE/ITMC), 2017
Industry 4.0 is announced as a fourth industrial revolution. The next level of evolution will com... more Industry 4.0 is announced as a fourth industrial revolution. The next level of evolution will comprehend the wide spread inclusion of machines sensors and big data analytics. Enterprise Resource Planning and Manufacturing Execution Systems will be the information management tools for the revolution. Different forms of optimization will be in the brink of development to answer this revolution needs. In this paper is proposed a model for solving a classical job shop scheduling problem, which is NP-hard in the strong sense. For accomplishing this, a test problem is run to evaluate the difference between the performance of Shifting Bottleneck Heuristic (SBH) and some dispatching rules, such as First Come First Served (FCFS), Earliest due Date (EDD), and Shortest Processing Time (SPT). The evaluation criteria used were the makespan (Cmax) and the total weighted tardiness (TWT). The results did show that the SBH outperforms the dispatching rules, although the computation time turns out to...
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Papers by Leonilde Varela