Browsing by Author "Varela, Leonilde"
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- A Contribution for Generalization of Scheduling Problem ClassesPublication . Putnik, Goran; Alves, Cátia; Varela, Leonilde; Ávila, PauloIt is identified that different scheduling problem classes are just special cases of one “general scheduling problem” that is that a number of traditional scheduling problem classes (for the case of 64 classes obtained by combination of 6 parameters) could be reduced to the scheduling problem for a set of lots, with one part per lot. “General scheduling problem” definition helps to minimize the simulator’s size/complexity concerning modeling and evaluation of three scheduling paradigms. Further, for scheduling problems different notations were developed to represent different scheduling problems classes. In this paper we introduced a new field into the Graham´s notation, named “sub-problem solution classes”, considering that the general solution (objective) is integrated over solutions for sub-problems.
- Framework for a risk assessment model to apply in Virtual / Collaborative EnterprisesPublication . Ávila, Paulo; Mota, Alzira; Bastos, João; Patrício, Leonel; Pires, António; Castro, Helio; Cruz-Cunha, Maria Manuela; Varela, LeonildeRisk assessment is a theme of large spectrum applied in different fields. In the context of Virtual / Collaborative Enterprises there are several risks whose assessment should be aware to avoid undesirable consequences either for entire networked or for a partner in particular. The objective of this work is centered on the creation of a framework / guidelines to serve as a basis for the creation of a better risk assessment model for Virtual / Collaborative Enterprises. This work analyzed the few models available in the literature and identified some gaps that were used to purpose complementary guidelines for the design and / or improve the future risk assessment models. The pointed guidelines covered three important topics: risk factors; assessment methods; and the impact in different life cycle phases of a Virtual / Collaborative Enterprise. Considering the results of the work it is our conviction that there is space to improve the research in this field and a more robust and flexible risk assessment model should be developed.
- Literature review of decision models for the sustainable implementation of Robotic Process AutomationPublication . Patrício, Leonel; Ávila, Paulo; Varela, Leonilde; Cruz-Cunha, Maria Manuela; Pinto Ferreira, Luís; Bastos, João; Castro, Helio; Silva, JoséRobotic Process Automation (RPA) is a rules-based system for automating business processes by software bots that mimic human interactions to relieve employees from tedious work. It was verified in the literature that there are few works related to RPA decision support models. This technology is in great growth and, therefore, it becomes important to study the evaluation of the implementation of RPA. The objective of this work is focused on a literature review for the identification and analysis of Robotic Process Automation implementation models. This work analyses some models or studies available in the literature and, in addition, analyses it from a perspective relating to the Triple Bottom Line (TBL) related to environmental, social and economic effects. Regarding the results obtained, it appears that there is still a lot of room to improve research in this field, for example, with regard to the development of an evaluation model for the implementation of the RPA, taking into account the TBL of the sustainability concept.
- Manufacturing and Management Paradigms, Methods and Tools for Sustainable Industry 4.0-Oriented Manufacturing SystemsPublication . Varela, Leonilde; Ávila, Paulo; Castro, Helio; Putnik, Goran D.; Fonseca, Luís; Ferreira, LuísIn the current Industry 4.0 era (I4.0, for short) [1–3], manufacturing and management (M&M) paradigms, methods and tools should be wisely developed to fulfil sustainability issues, regarding not just economic but also social and environmental concerns by simultaneously fostering organizational efficiency excellence and transformational initiatives, therefore contributing to enduring business results.This Special Issue aims to provide new insights regarding manufacturing or management paradigms (strategies), methods, tools, and practices aligned with the contemporary necessity to create and implement sustainable I4.0 manufacturing systems. Each of the five selected papers of this Special Issue makes a novel contribution to that aim.
- Supplier evaluation and selection: a fuzzy novel multi-criteria group decision-making approachPublication . Kusi-Sarpong, Simonov; Varela, Leonilde; Putnik, Goran; Modrák, Vladimír; Ávila, Paulo; Machado, José; Brobbey Agyemang, JohnSuppliers’ evaluation and selection is a subject widely explored through many different kinds of approaches and multi-criteria decision methods, and more recently also through group decision making ones. This paper addresses these problems by proposing an easy-going two-phase supplier selection decision model that uses a scientific approach and incorporates performance criteria in screening and selecting the potential suppliers for further optimal supplier selection. The first phase of the model determines the performance of the suppliers on both quantitative and qualitative criteria and the relative importance weights of the criteria. Fuzzy set theory is utilized to deal with the imprecision and vagueness involved with the subjective judgment of both the qualitative data of the decision-matrix and the relative importance weights of the criteria. In the second phase, the suppliers are screened using their efficiencies and an agreed threshold. Then, the optimal supplier for corporation is selected from the limited potential suppliers set. To illustrate the applicability and validate the proposed model, a case study of a beverage producing company located in Ghana, the Sub-Saharan Africa is proposed. The results of the study can provide valuable clues and guidelines to decision-makers and analyst in pre-contract negotiations. The proposed model will assist practicing managers to effectively reduce their supply-base and efficiently select the optimal supplier for corporation. Implications of the study to the theory and practice and future research directions are also outlined.
- The potential of value analysis application in the furniture industry – a case study at IKEAPublication . Pires, António; Ávila, Paulo; Putnik, Goran; Varela, Leonilde; Cruz-Cunha, Maria Manuela; Caldeira, RitaValue analysis methodology uses a structured and methodical job plan contemplating several steps to ensure success in its application. This paper intends to perspective the potential of value analysis application, namely in the furniture industry. To draw conclusions of this potential a case study was developed at an IKEA factory in Portugal. To characterize the customer needs in a clear language and to quantify the value of a product (a bookcase) produced in this factory, a value analysis study was developed. Functional analysis is the most known and distinctive phase of value analysis and is, nowadays, an autonomous tool. With this functional analysis, the authors intend to describe the functions that the product performs, to provide a better knowledge of the product, to evaluate the degree of satisfaction of the product through its functional performance and to facilitate the search for alternative solutions. The results obtained allowed us to reach some important conclusions about the application of value analysis in this type of industry and can be an initial step to promote the use of this tool in this kind of industry.