Coleção de Artigos Acadêmicos
URI permanente para esta coleçãohttps://repositorio.insper.edu.br/handle/11224/3227
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59 resultados
Resultados da Pesquisa
Artigo Científico An Automated Electronic System in a Motorized Wheelchair for Telemonitoring: Mixed Methods Study Based on Internet of Things(2023) Gradim, Luma Carolina Câmara; Santana, André Luiz Maciel; José, Marcelo Archanjo; Zuffo, Marcelo Knörich; Lopes, Roseli de DeusBackground: Wheelchair positioning systems can prevent postural deficits and pressure injuries. However, a more effective professional follow-up is needed to assess and monitor positioning according to the specificities and clinical conditions of each user. Objective: This study aims to present the concept of an electronic system embedded in a motorized wheelchair, based on the Internet of Things (IoT), for automated positioning as part of a study on wheelchairs and telemonitoring. Methods: We conducted a mixed methods study with a user-centered design approach, interviews with 16 wheelchair users and 66 professionals for the development of system functions, and a formative assessment of 5 participants with descriptive analysis to design system concepts. Results: We presented a new wheelchair system with hardware and software components developed based on coparticipation with singular components in an IoT architecture. In an IoT solution, the incorporation of sensors from the inertial measurement unit was crucial. These sensors were vital for offering alternative methods to monitor and control the tilt and recline functions of a wheelchair. This monitoring and control could be achieved autonomously through a smartphone app. In addition, this capability addressed the requirements of real users. Conclusions: The technologies presented in this system can benefit telemonitoring and favor real feedback, allowing quality provision of health services to wheelchair users. User-centered development favored development with specific functions to meet the real demands of users. We emphasize the importance of future studies on the correlation between diagnoses and the use of the system in a real environment to help professionals in treatment.Artigo Científico Prediction of bacterial and fungal bloodstream infections using machine learning in patients undergoing chemotherapy(2025) Freire, Maristela P.; ADHEMAR VILLANI JUNIOR; Lazar Neto, Felippe; Lage, Luis Alberto De Padua Covas; Oliveira, Maura Salaroli; Abdala, Edson; Nunes, Fatima L.S.; Levin, Anna Sara S.Purpose This study aimed to develop a machine learning (ML) model to predict bloodstream infection (BSI) in chemotherapy patients. Patients and methods We included all cancer patients undergoing chemotherapy at a tertiary cancer hospital from 2017 to 2022. Data were collected per chemotherapy cycle, including chemotherapy drugs, indications, cycle number, cancer type, body mass index, age, gender, complete blood count, creatinine levels, and microbial cultures. BSI was assessed within 21 days after chemotherapy. The ML algorithms tested included logistic regression, ridge regression, k-nearest neighbors, Naive Bayes, Perceptron, neural networks, decision trees, boosting methods, Random Forests, and Support Vector Machines. The SHapley Additive exPlanations (SHAP) method was used to measure feature importance. Results Among 107,757 cycles from 19,225 patients, 91.7 % had solid tumors, primarily breast (36.8 %) and gastrointestinal (19.4 %) cancers. The first cycle accounted for 23.7 % of cycles, and palliative chemotherapy made up 52.9 %. Alkylating agent was the most common drug class used (55.5 %). BSI occurred in 1.33 % of cycles, with 34 % of these cases occurring in neutropenic patients. Of the bacteremia cases, 11.8 % were polymicrobial, and 69.3 % involved gram-negative bacteria. The best model was a neural network with one hidden layer (5 neurons), achieving 70.7 % sensitivity, 93.49 % specificity, 93.19 % accuracy, and an area under a receiver operating characteristic curve of 91.93 %. Key predictors included the first cycle, antimetabolite use, palliative chemotherapy, monocytopenia, and hematological malignancies. Conclusion ML effectively predicts bacteremia in chemotherapy patients, including non-neutropenic cases, and could be used in clinical practice to guide treatment and infection workup.Artigo Científico Evaluation of artifacts produced by cannulated and solid-core screws using magnetic resonance imaging and computed tomography(2026) Cassanego, Guilherme Rech; Rahal, Sheila Canevese; Santos, Tauan Silva Gouveia; Silva, Jeana Pereira da; Santos, Diogo Borges Renó dos; Mamprim, Maria Jaqueline; Carbonari, Marcelo José; Siqueira, Rafael CerântolaThis study aimed to evaluate, using both magnetic resonance imaging (MRI) and computed tomography (CT), the imaging artifacts associated with two types of titanium screws—cannulated and solid—from three different manufacturers, implanted in the canine humeral condyle. Three groups were established: G1 – 3.5 × 30 mm solid cortical screws and partially threaded cannulated screws; G2 – 3.5 × 28 mm solid cortical screws and 3.5 × 26 mm fully threaded conical compression cannulated screws; and G3 – 3.5 × 30 mm solid screws and 3.0 × 26 mm fully threaded conical compression cannulated screws. MRI evaluation was performed using SE DP/T2, Turbo 3D T1, STIR, and fast FLAIR sequences, while CT evaluation used transverse images. On MRI, solid screws produced more discrete and localized artifacts, mainly as peri-implant signal void/blooming with minimal geometric distortion and mild limitation of cortical and articular surface assessment. In contrast, cannulated screws generated larger areas of signal loss, especially in Turbo 3D T1 and fat-suppressed STIR/FLAIR sequences, although humeral condyle evaluation remained feasible. On CT, solid screws exhibited more pronounced metallic artifacts (beam hardening, streaks, mild blooming) compared with cannulated screws; however, these artifacts did not prevent assessment of peri-implant structures. Artifact measurements on MRI (Turbo 3D T1) and CT were higher for cannulated screws in G1 and G2, whereas in G3 solid screw produced greater artifact. In conclusion, both design and material composition of the screw significantly influence image quality, highlighting the importance of considering these factors when selecting the screw and planning imaging protocols.Artigo Científico Who gets the Better Deal in Marriage? Examining Racial Differences in Brazilian Marriage Market(2025) Duque, Daniel; França, Michael; Mendonca, MilenaThis paper studies women’ marriage market in Brazil, investigating socioeconomic disparities and their trends in marriage outcomes. Relying on nationally representative data from the National Household Sample Survey (PNAD) covering 2002 to 2024, we analyze the association between marital status and these variables, as well as patterns of assortative mating by examining the educational and productivity pairing within couples. The results indicate that higher educational attainment among women is associated with a greater likelihood of being married, but, after accounting for education and age, black and mixed-race women continue to exhibit lower marriage rates relative to white counterparts. The analysis also reveals a strong persistence of educational assortment among spouses, but black and mixed-race women have lower quality husbands, even with sociodemographic controls, with non-consistent trends towards more or less inequality. We also show that a similar pattern arises across parental education, with black women from highly educated parents having lower marriage outcomes. Together, these findings advance the understanding of how economic sorting in the marriage market can reinforce broader patterns of racial and educational inequality in Brazil.- Analytical definitions of connectivity, incidence and node matrices for t-struts tensegrity prisms(2024) Paiva, Victor A.S.M.; Kurka, Paulo R.G.; Izuka, Jaime H.Regular tensegrity prism modules are widely used by researchers. Numerous research articles combine them to form grids and towers under various assembly strategies. Most of them define connectivity and node matrices that satisfy their structures as a whole, but a general definition for the basic modules has not been formally reported. This paper formalizes sets of definitions for the connectivity, incidence, and node matrices that are valid for any tensegrity prism formed by four struts or more. The definitions are based on geometry and provide simple and general formulations by applying floor and ceiling operators. Both clockwise and counterclockwise rotated modules are covered.
Artigo Científico Assets of foreignness in a regulated industry(2024) Santos, Leonardo Nery dos; Sheng, Hsia Hua; ADRIANA BRUSCATO BORTOLUZZOPurpose – Foreign subsidiaries incur substantial institutional conformity costs because they have to respond to host-country institutional pressures (Slangen & Hennart, 2008). The purpose of this paper is to study this type of cost from institutional and regulatory perspectives. The authors argue that these costs decrease when the host country adopts concepts of international regulations that multinationals may be familiar with due to their own home country regulation experience. This prior regulatory experience gives foreign subsidiaries an advantage of foreignness (AoF), which can offset their liability of foreignness (LoF). Design/methodology/approach – This study compared the returns on assets of 35 domestic firms with those of foreign subsidiaries in the Brazilian energy industry between 2002 and 2021, using regression dynamic panel data. Findings – The existence of a relationship between the international regulatory norm and the Brazilian regulator has transformed the LoF into an advantage of foreignness to compete with local energy firms. The results also suggest that the better the regulatory quality of the subsidiary’s country of origin, the better its performance in Brazil, as it can reduce compliance costs. Finally, the greater the psychic distance between Brazil and the foreign subsidiary’s home country, the worse its performance. Research limitations/implications – The research suggests that one of the keys to competitiveness in host countries is local regulatory ties. Prior international regulatory experience gives foreign subsidiaries an asset of foreignness (AoF). This result complements the current institutional and regulatory foreignness studies on emerging economies (Cuervo-Cazurra & Genc, 2008; Mallon et al., 2022) and the institutional asymmetry between home and host country (Mallon & Fainshmidt, 2017). Practical implications – This research suggests that one of the keys to competitiveness in host countries is local regulatory ties. Prior international regulatory experience gives foreign subsidiaries an asset of foreignness (AoF). This result complements the current institutional and regulatory foreignness studies on emerging economies (Cuervo-Cazurra & Genc, 2008; Mallon et al., 2022) and the institutional asymmetry between home and host country (Mallon & Fainshmidt, 2017). The practical implication is that the relationship between conformity costs, capital budget calculation and strategic planning for internationalization will be related to the governance quality of the home country of multinationals. The social implication is that a country interested in attracting more direct foreign investment to areas that need foreign technology transfer and resources may consider adopting international regulatory standards. Social implications – The social implication is that a country interested in attracting more direct foreign investment to areas that need foreign technology transfer and resources may consider adopting international regulatory standards. Originality/value – This research discuss firm and local regulator tie is one of core competitiveness in host countries (Yang and Meyer, 2020). This study also complements the current institutional and regulatory foreignness studies in emerging economy (Cuervo-Cazurra & Genc, 2008; Mallon et al., 2022). Second, prior regulatory experience of multinational enterprise in similar environment can affect its foreign affiliate performance (Perkins, 2014). Third, this study confirms current literature that argues that knowledge and ability to operate in an institutionalized country can be transferred from parent to affiliate. In the end, this study investigates whether AoF persists when host governments improve the governance of their industries.Artigo Científico Roads, transit and spatial patterns of urbanization in São Paulo: Evidence from the second half of the twentieth century(2025) Zegras, P. Christopher; ADRIANO BORGES FERREIRA DA COSTA; Zheng, SiqiThis article presents evidence of distinct long-term impacts from road and rail infrastructures on urban outgrowth and densification in São Paulo, Brazil (1947–1997) within a Global South context. Using long-difference ordinary least squares models and an instrumental variable approach, we find that the construction of avenues and arterial roads across urbanized areas drove urban expansion and accounted for forty percent of the outgrowth during this 50-year period. In contrast, rail transit investments fostered vertical neighborhood development responsible for one-third of the increase in floor area ratio, while also promoting land use specialization by attracting commercial buildings to central areas and stimulating residential real estate development in peripheral zones. Our findings align with patterns observed in the Global North, reinforcing the broader relationship between transportation investments and urban form.Artigo Científico Global Events Demand Global Data: COVID-19 Crisis Responses and the Future of Selling and Sales Management Around the Globe(2024) Rouziou, Maria; Bolander, Willy; Karen Peesker; Hautamäki, Pia; Rangarajan, Deva; Samaraweera, Manoshi; Bullemore, Jorge; Klein, Michel; Agnihotr, Raj; Jensen, Karina Burgdorff; Fournier, Christophe; DANNY PIMENTEL CLARO; Gonzalez, Gabriel R.; Guenzi, Paolo; Kadić-Maglajlić, Selma; Lai-Bennejean, Christine; Palomino-Tamayo, Walter; Ryals, Lynette; CARLA SOFIA DIAS MOREIRA RAMOS; Salas, Jim; Shi, Huanhuan; Squire, Philip; Westphal, JörgIn the context of the global crisis presented by the COVID-19 pandemic, the authors investigate the perspectives of sales managers regarding their organizations’ responses to the crisis and future expectations in a post-COVID-19 world. While there has been much discussion about these topics in the sales literature, very little research has examined them globally by collecting data from many nations and across many continents. Yet, how can global events be understood without analyzing global data? In response, the authors convened the first, to their knowledge, global data coalition by hosting video-recorded group interviews with 76 sales executives representing 27 nations. This inductive investigation, informed by institutional logics, reveals how organizations accepted new norms, retained old ones, or blended the old with the new in response to the crisis. The results simultaneously validate certain emerging concepts on a global scale (e.g., customer success management, bricolage) and give rise to several insights not currently detailed by extant scholarship (e.g., localization, cultural cringe). This work also catalyzes new, relevant avenues for international research and sheds light on issues facing sales practice globally.Artigo Científico Private ownership of water and wastewater systems: Assessing health impacts(2025) Chaves, Rodrigo França; ADRIANO BORGES FERREIRA DA COSTAThis study examines the impact of private ownership of water and wastewater systems on disease reduction linked to sanitation in Brazil from 1998 to 2021. It updates Saiani and de Azevedo (2018), which analyzed the period 1995–2008, by incorporating over a decade of additional data, key policy changes such as the 2020 Sanitation Law, and employing the Callaway–Sant’Anna Staggered DID methodology to address heterogeneity in treatment effects. Our findings reveal mixed results: while some municipalities achieved reductions in morbidity rates, others showed no change or increases, underscoring the context-dependent nature of privatization outcomes. A notable example is the case of Tocantins, where transitioning from a hybrid private-state model to full private ownership led to a significant decrease in disease morbidity, particularly among the most affected age groups. These advancements provide a robust, updated perspective on the privatization debate, offering valuable implications for policy and practice.Artigo Científico A systematic literature review of citizen science in urban studies and regional urban planning: policy, practical, and research implications(2025) Beck, Donizete; Mitkiewicz, JulianaCitizen Science (CS) has been useful in research development and policymaking, where laypeople contribute to collecting and/or analyzing data. With the technological advancement of smart cities and data analysis techniques, CS helps foster efficient/sustainable cities and data-driven decision-making. However, more effort is needed to make CS more accessible for urban scholars and practitioners. Thus, we provided a comprehensive overview of CS in Urban Studies and Regional Urban Planning (USRUP) by revealing the main thematic/method approaches, stakeholder roles, socioeconomic/environ mental/policy impacts, limitations, best practices, and cases. Thus, we performed a Systematic Literature Review on CS in USRUP using the PRISMA Guidelines of 94 studies collected from the Web of Science Core Collection, published by 2023. Our key findings underscore the practical uses of diverse methodologies and approaches employed in CS projects, emphasizing their potential to enhance urban research and policymaking. The core socioeconomic impacts of CS projects are fostering community empowerment, engagement, and educational opportunities. The main environmental impacts are enhancing monitoring capabilities, improving ecosystem service assessments, and supporting adaptive management practices. As for urban planning and policies, CS projects can foster data-driven planning, urban sustainability, urban resilience, healthier cities, and social equity. CS challenges include data quality and consistency, the digital divide, and the need for sustained funding. Best practices have included clear communication, standardized protocols, and strong community engagement. Further developments should involve citizens in more analytical roles (rather than merely instrumental ones, like data collection) in CS projects and explore CS in social urbanism for transforming vulnerable communities.