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Direct assignment of the dynamics of a laboratorial model using an active bracing system
Moutinho, C.,Cunha, A.,Caetano, E. Techno-Press 2011 Smart Structures and Systems, An International Jou Vol.8 No.2
This article describes the research work involving the implementation of an Active Bracing System aimed at the modification of the initial dynamics of a laboratorial building structure to a new desired dynamics. By means of an adequate control force it is possible to assign an entirely new dynamics to a system by moving its natural frequencies and damping ratios to different values with the purpose of achieving a better overall structural response to external loads. In Civil Engineering applications, the most common procedures for controlling vibrations in structures include changing natural frequencies in order to avoid resonance phenomena and increasing the damping ratios of the critical vibration modes. In this study, the actual implementation of an active system is demonstrated, which is able to perform such modifications in a wide frequency range; to this end, a plane frame physical model with 4 degrees-of-freedom is used. The Active Bracing System developed is actuated by a linear motor controlled by an algorithm based on pole assignment strategy. The efficiency of this control system is verified experimentally by analyzing the control effect obtained with the modification of the initial dynamic parameters of the plane frame and observing the subsequent structural response.
Direct assignment of the dynamics of a laboratorial model using an active bracing system
C. Moutinho,A. Cunha,E. Caetano 국제구조공학회 2011 Smart Structures and Systems, An International Jou Vol.8 No.2
This article describes the research work involving the implementation of an Active Bracing System aimed at the modification of the initial dynamics of a laboratorial building structure to a new desired dynamics. By means of an adequate control force it is possible to assign an entirely new dynamics to a system by moving its natural frequencies and damping ratios to different values with the purpose of achieving a better overall structural response to external loads. In Civil Engineering applications, the most common procedures for controlling vibrations in structures include changing natural frequencies in order to avoid resonance phenomena and increasing the damping ratios of the critical vibration modes. In this study, the actual implementation of an active system is demonstrated, which is able to perform such modifications in a wide frequency range; to this end, a plane frame physical model with 4 degrees-of-freedom is used. The Active Bracing System developed is actuated by a linear motor controlled by an algorithm based on pole assignment strategy. The efficiency of this control system is verified experimentally by analyzing the control effect obtained with the modification of the initial dynamic parameters of the plane frame and observing the subsequent structural response.
Seongsoo Jang,Luiz Moutinho 글로벌지식마케팅경영학회 2015 Global Fashion Management Conference Vol.2015 No.06
This study investigates (1) how promotion activities in intra-firm and inter-firm levels influence customers’ total spending amount (revenue) and (2) how customer- and firm-generated online information influences revenue directly and indirectly in luxury hotel industry.
National utilization of rib fracture fixation in the geriatric population in the United States
Brewer Jennifer M.,Aakjar Leah,Sullivan Kelsey,Jayaraman Vijay,Moutinho Manuel,Jeremitsky Elan,Doben Andrew R. 대한외상학회 2022 大韓外傷學會誌 Vol.35 No.3
Purpose: The use of surgical stabilization of rib fractures (SSRF) has steadily increased over the past decade. Recent literature suggests that a larger population may benefit from SSRF, and that the geriatric population—as the highest-risk population—may receive the greatest improvement from these interventions. We sought to determine the overall utilization of SSRF in the United States.Methods: The National Trauma Database was analyzed between 2016 and 2017. The inclusion criteria were all patients ≥65 years old with rib fractures. We further stratified these patients according to age (65–79 vs. ≥80 years old), the presence of coding for flail chest, three or more rib fractures, and intervention (surgical vs. nonoperative management). The main outcomes were surgical interventions, mortality, pneumonia, length of stay, intensive care unit length of stay, ventilator use, and tracheostomy.Results: Overall, 93,638 patients were identified. SSRF was performed in 992 patients. Patients who underwent SSRF had improved mortality in the 65 to 79 age group, regardless of the number of ribs fractured. We identified 92,637 patients in the age group of 65 to 79 years old who did not undergo SSRF. This represents an additional 20,000 patients annually who may benefit from SSRF.Conclusions: By conservative standards and the well-established Eastern Association for the Surgery of Trauma clinical practice guidelines, SSRF is underutilized. Our data suggest that SSRF may be very beneficial for the geriatric population, specifically those aged 65 to 79 years with any rib fractures. We hypothesize that roughly 20,000 additional cases will meet the inclusion criteria for SSRF each year. It is therefore imperative that we train acute care surgeons in this skill set.
Sérgio Lúcio Pereira de Castro Lopes,Isadora Luana Flores,Thiago de Oliveira Gamba,Rivea Ines Ferreira-Santos,Mari Eli Leonelli de Moraes,Aline Alvarez Cabello,Paula Nascimento Moutinho 대한구강악안면외과학회 2017 대한구강악안면외과학회지 Vol.43 No.2
Maxillofacial images must be examined to find pathologies not identified during clinical examination. Unicystic ameloblastoma (UA) extending to the mandibular body and ramus was neglected on initial panoramic radiographic examination. After orthodontic therapy, a huge lesion was observed clinically and through imaging exams. After the conservative surgery, no recurrence was observed during five years of follow-up. This case emphasized the need for careful evaluation of patient images focusing on the oral diagnosis before any dental treatment planning, including orthodontic therapy.