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- Performance Comparison of Redis, Memcached, MySQL, and PostgreSQL: A Study on Key-Value and Relational DatabasesPublication . Almeida, Dany; Lopes, Maria; Saraiva, Luzia; Abbasi, Maryam; Martins, Pedro; Silva, José; ANTUNES VAZ, PAULO JOAQUIMThis paper investigates and compares the performance of relational databases (MySQL and PostgreSQL) and key-value databases (Memcached and Redis) under various test loads. The study utilizes the Yahoo! Cloud Serving Benchmark to simulate diverse workloads and measure the behavior of these databases in different scenarios. The primary focus is on evaluating run time, throughput, and average latency metrics to understand how each database type handles varying thread levels and workload intensity. The outcomes of this research provide valuable insights into the scalability and efficiency aspects of relational databases. By conducting a comprehensive performance comparison, the study aims to assist database designers and developers in selecting the most suitable database option based on specific requirements. The findings contribute to informed decision-making regarding the choice between key-value and relational databases in various data storage scenarios.
- Enhancing Organizational Data Integrity and Efficiency through Effective Data LineagePublication . Silva, Carlos; Abbasi, Maryam; Martins, Pedro; Silva, José; ANTUNES VAZ, PAULO JOAQUIM; Mota, DavidIn the era of exponential data growth and the growing reliance of organizations on data-driven decision-making, understanding the origin, transformation, processing, and destination of data has become crucial. Unfortunately, data arriving at organizations is often incorrect or structured differently, leading to analytical errors and compromising data integrity. Without well-documented data mapping and lineage, organizations risk making strategic decisions based on flawed or inaccurate data. Consequently, the implementation of a robust Data Lineage solution has emerged as a vital component for organizational success. Such a solution not only enables error identification, but also facilitates cost reduction by pinpointing inefficient data processing points and driving efficiency improvements. However, finding the right Data Lineage solution tailored to an organization’s specific requirements remains a challenge. Therefore, it is imperative to select and implement a suitable solution that aligns with each organization’s needs.
- A Hybrid Strategy for Oven Optimization in Aerospace Manufacturing: Lean Principles and Mathematical ModellingPublication . Pereira, M. Teresa; Pereira, Marisa G.; Ferreira, Fernanda A.; Silva, Francisco G.; Guimarães, AndréAdopting the Lean philosophy is essential for reducing costs and increasing productivity in industrial environments, where equipment efficiency plays a pivotal role. This study focuses on optimizing the use of an oven, a critical equipment, in the aircraft parts manufacturing process, in a company producing composite components for aerospace applications. A mathematical model based on the classic two-dimensional knapsack problem was developed to address inefficiencies in space utilization and workflow inconsistencies. The model was implemented to determine the optimal parts’ allocation, maximizing oven occupancy while ensuring efficient workflows. The study introduces a hybrid strategy that combines a structured allocation system with vertical shelving units to streamline part storage and improve the kiln-loading process. Extensive experiments validated the model’s performance, demonstrating its ability to support Lean principles by enhancing productivity and reducing costs in the aeronautical industry. This work underscores the importance of mathematical modelling for optimizing manufacturing processes and meeting the increasing demands of modern production environments.
- A Importância Da Soldadura De Termoplásticos: Um Estudo De Comparação De Processos Com Caraterísticas DistintasPublication . Trindade, Adelino; Guimarães, AndréTrês dos processos de soldadura mais utilizados na ligação de termoplásticos modernos foram analisados e comparados neste trabalho, concretamente a soldadura por gás quente (HGW), a soldadura por raio laser (LBW) e a soldadura por fricção (FSW). Os processos referidos foram utilizados na soldadura de vários materiais termoplásticos distintos, dando foco em apenas três desses materiais, tais como: polipropileno (PP), polietileno (PE) e policloreto de vinil (PVC). A qualidade obtida nas diferentes soldaduras foi avaliada recorrendo a uma análise visual, bem como através de ensaios de resistencia a tracção. Foram também realizados ensaios de dureza de Vickers ás juntas soldadas, que revelaram algumas alterações microestruturais. O estudo efetuado teve como finalidade melhorar o conhecimento dos mecanismos envolvidos na execução dos processos de soldadura utilizados e na análise da resistência das juntas soldadas.
- Uma Análise Bibliométrica referente à Indústria e aos Modelos de Avaliação do Nível de Maturidade Digital da PMEsPublication . Guimarães, André; Reis, Pedro; Charrua-Santos, FernandoO presente estudo, através do uso de técnicas bibliométricas, teve como principal intuito contribuir para a estruturação e análise da literatura científica disponível no campo da investigação relativa a Modelos de Avaliação de Maturidade Digital à Indústria 4.0 das pequenas e médias empresas (PMEs). Apesar da transformação digital não ser um fenómeno recente, este conceito continua pertinente e atual, afetando as empresas de pequena e média dimensão e constituindo assim uma oportunidade da sua integração na economia mundial. Neste estudo, realizou-se uma revisão exaustiva da literatura científica, tendo sido efetuada uma análise bibliométrica no que concerne à literatura sobre esta temática. Foram avaliadas as principais tendências de pesquisa e identificados os dez artigos mais relevantes, relativamente ao número de citações e publicações, bem como os autores mais citados, contribuindo com uma maior clareza do nível de desenvolvimento das PMEs, na integração e preparação para o novo paradigma da Indústria 4.0.
- The Paradox Between Concept Knowledge and Digital Maturity Level for Industry 4.0: The Portuguese CasePublication . Guimarães, André; Pereira, Rosivaldi; Pereira, Maria Teresa; Reis, Pedro; Cardoso, Antonio J. MarquesThis study investigates the paradox between theoretical knowledge of the Industry 4.0 (I4.0) concept and the actual level of digital maturity observed in Portuguese industrial companies. Specifically, it examines whether companies’ awareness of I4.0, geographic location, and size influence their capacity to adopt and integrate digital technologies. Data were collected from a sample of 450 companies through a structured self-assessment questionnaire developed in collaboration with the Shift2Future consortium. The instrument evaluated the degree of familiarity with the I4.0 concept and the stage of digital maturity across different dimensions. The statistical analysis applied ordinal logistic regression models and chi-square tests to assess three hypotheses related to the potential influence of concept knowledge, regional distribution, and company size. The results reveal no statistically significant relationship between the tested variables and the level of digital maturity, suggesting that individual factors do not primarily drive digital advancement. Instead, the findings indicate that broader structural and strategic dimensions, such as leadership commitment, participation in support programs, availability of qualified human resources, and alignment with national and European digitalization agendas, are more decisive in determining companies’ digital readiness. These results challenge common assumptions in the literature, which often posit a direct relationship between company characteristics and technological integration. The study highlights the limited predictive power of isolated variables and highlights the importance of a systemic and integrated approach to promoting digital transformation. The findings contribute to academic and policy discussions by identifying the need for more comprehensive frameworks considering the complex interplay of internal capabilities and external enablers. Future research should expand this approach by including longitudinal and sector-specific analyses and qualitative data to explore internal organizational dynamics, leadership behaviour, and employee digital literacy. The data gained can support designing more effective and inclusive digital transition strategies for industrial firms in Portugal and similar European contexts.
- Industry 4.0 in Portugal - Economic Sectors MaturityPublication . Pedro Reis; Guimarães, André; Reis, Pedro; Cardoso, Antonio J. MarquesAssessing digital maturity is critical to successfully implementing Industry 4.0 in companies. This study evaluates the digital maturity of Portuguese companies across different regions and sectors using the Shift2Future tool, a self-assessment model adapted to the Portuguese context. The model assesses six dimensions: Strategy and Organization, Smart Infrastructure, Smart Operations, Smart Products, Data-Driven Services, and Human Resources, on a Likert scale from 0 to 5. Data was gathered from 610 companies across sectors like automotive, ceramics, and metalworking through a questionnaire conducted between 2022 and 2023. Using STATA 18.0 software, the analysis included Pearson correlation and Exploratory Factor Analysis (EFA). The results indicate that companies in the North and Lisbon & Tagus Valley regions exhibit higher digital maturity. Traditional sectors like ceramics and glass show lower maturity due to technological and cultural challenges. This study evaluates the digital maturity of Portuguese businesses and suggests ways to improve their Industry 4.0 competitiveness.
- Industry 4.0 - Assessment of Digital Readiness of Manufacturing Companies in PortugalPublication . Guimarães, André; Reis, Pedro; Charrua-Santos, FernandoThe Portuguese industrial culture is going through some challenges and difficulties in the new phase of digitalization, using the development of several technologies that provide digital solutions aligned with Industry 4.0 (I4.0). To evaluate the digital readiness for I4.0 of industries companies, namely small, medium and large companies, a IMPULS model was used, which allowed quantifying and qualifying their level of readiness to implement I4.0 technologies, considering different dimensions and subdimensions. It is found that not all companies have the same pace and facility in adopting and implementing these technologies, where business strategies are not integrated with I4.0, resulting in the absence of an accurate selfassessment on the real maturity level achieved. Therefore, it is of great importance to understand how companies are facing different challenges and difficulties in the digital transition. This work aimed to assess the level of digital readiness to I4.0 of manufacturing companies in Portugal, in global and dimensional terms for each region. The overall assessment level is low (beginner) and the Smart Infrastructure and Data-driven Services dimensions are weak (outsider).
- The servperf model as a quality evaluation tool in hotel unitsPublication . Costa, Adriano; Fernandes, Gonçalo; Antunes, JoaquimThe objective of this study is to demonstrate through the use of the Servperf model which variables are most valued by guests in accommodation units in Portugal. This study is based on the Servperf model, which measures the quality of services from the point of view of the guest (customer), identifying each of the 5 dimensions (tangibility, reliability, responsiveness, assurance and empathy), which globally qualify the service of the accommodation unit, identifying processes that can be improved in order to increase overall guest satisfaction. This Servperf model, developed by the authors Cronin and Taylor (1992), seeks to evaluate the quality of services, pointing out alternatives for improvement to the limitations they believe exist in the Servqual model of Parasuraman et al. (1988).
- Perception of the image of thermal spas in PortugalPublication . Teixeira, Francisca; Fassarela, Ana; Sousa, Alda; Costa, João Pedro; Antunes, JoaquimThe image of destinations is of great importance in the process of developing tourism for a location, acting not only as a way of differentiating itself from its potential competitors, but, mainly, as an attempt to provide economic support for the sustainable development of the destination (Chagas, 2009). The spa sector in Portugal assumes a growing importance in regions with low population density, where most of the resorts are located, as it is sometimes the main employer in the region (Hofer, et al. 2012; Costa & Antunes, 2022). Thus, the main objective of this study is to evaluate the determinants of the image of a thermal destination in Portugal, in order to improve or (re)position the image of the destination efficiently.