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RISS 인기검색어
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- 저자 : Rizzo, Stefania (검색결과 50 건)
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Giacomo Emanuele Maria Rizzo,Giuseppina Ferro,Giovanna Rizzo,Giovanni Di Carlo,Alessandro Cantone,Gaetano Giuseppe Di Vita,Carmelo Sciumè 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.2
Iatrogenic perforations are severe complications of gastrointestinal endoscopy; therefore, their management should be adequatelyplanned. A 77-year-old man with a history of diverticulosis underwent a colonoscopy for anemia. During the procedure, aniatrogenic perforation occurred suddenly in the sigmoid colon, near a severe angle among the numerous diverticula. Through-thescopeclips were immediately applied to treat it and close mucosal edges. Laboratory tests showed increased levels of inflammationand infection, and although there were no complaints of abdominal pain, the patient had an extremely distended abdomen. Amultidisciplinary board began management based on a conservative approach. Pneumoperitoneum was treated with computedtomography-assisted drainage. After 72 hours, his intestinal canalization and laboratory tests were normal. Though this adverseevent is rare, a multidisciplinary board should be promptly gathered upon occurrence, even if the patient appears clinically stable, toconsider a conservative approach and avoid surgical treatment.
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Current practices and recent advances in condition assessment of aged ships
Rizzo, C. M.,Paik, J. K.,Brennan, F.,Carlsen, C. A.,Daley, C.,Garbatov, Y.,Ivanov, L.,Simonsen, B. C.,Yamamoto, N.,Zhuang, H. Z. Taylor Francis 2007 SHIPS AND OFFSHORE STRUCTURES Vol.2 No.3
<P> Ship structures are likely to be subject to age-related deterioration such as corrosion wastage, cracking or mechanical damage. It has reportedly been recognised that such age-related deterioration is almost always involved in the catastrophic failures of ship structures including total losses. While such accidents typically cause concern to the public, maintenance and repair of aged structures is quite costly and complex. It is thus of great importance to develop advanced technologies allowing for proper management and control of such age-related deterioration. This paper summarises the report of the ISSC 2006 Committee V.6 presenting current practices, recent advances and future trends on condition assessment of aged ships. This includes assessment of the structural condition in view of the serviceability and safety, methods for repair, quantification of strength of deteriorated and repaired ships (as well as criteria for acceptable damage), with due account of the uncertainties involved. Consideration is also given to cost-benefit and risk-based decision procedures for remedial actions.</P>
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Rizzo, Piervincenzo,Lanza di Scalea, Francesco Techno-Press 2006 Smart Structures and Systems, An International Jou Vol.2 No.3
The structural monitoring of multi-wire strands is of importance to prestressed concrete structures and cable-stayed or suspension bridges. This paper addresses the monitoring of strands by ultrasonic guided waves with emphasis on the signal processing and automatic defect classification. The detection of notch-like defects in the strands is based on the reflections of guided waves that are excited and detected by magnetostrictive ultrasonic transducers. The Discrete Wavelet Transform was used to extract damage-sensitive features from the detected signals and to construct a multi-dimensional Damage Index vector. The Damage Index vector was then fed to an Artificial Neural Network to provide the automatic classification of (a) the size of the notch and (b) the location of the notch from the receiving sensor. Following an optimization study of the network, it was determined that five damage-sensitive features provided the best defect classification performance with an overall success rate of 90.8%. It was thus demonstrated that the wavelet-based multidimensional analysis can provide excellent classification performance for notch-type defects in strands.
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Prevalence of dental implant positioning errors: A cross-sectional study
Rizzo Gabriel,Prado Mayara Colpo,Rigo Lilian 대한영상치의학회 2022 Imaging Science in Dentistry Vol.52 No.4
Purpose: This study evaluated the prevalence of dental implant positioning errors and the most frequently affected oral regions. Materials and Methods: A sample was obtained of CBCT images of 590 dental implants from 230 individuals who underwent diagnosis at a radiology center using cone-beam computed tomography from 2017 to 2020. The following variables were considered: thread exposure, violation of the minimum distance between 2 adjacent implants and between the implant and tooth, and implant contact with anatomical structures. Descriptive data analysis and the Pearson chi-square test (P<0.05) were performed to compare findings according to mouth regions. Results: Most (74.4%) of the 590 implants were poorly positioned, with the posterior region of the maxilla being the region most frequently affected by errors. Among the variables analyzed, the most prevalent was thread exposure (54.7%), followed by implant contact with anatomical structures, violation of the recommended distance between 2 implants and violation of the recommended distance between the implant and teeth. Thread exposure was significantly associated with the anterior region of the mandible (P<0.05). The anterior region of the maxilla was associated with violation of the recommended tooth-implant distance (P<0.05) and the recommended distance between 2 adjacent implants (P<0.05). Implant contact with anatomical structures was significantly more likely to occur in the posterior region of the maxilla (P<0.05). Conclusion: Many implants were poorly positioned in the posterior region of the maxilla. Thread exposure was particularly frequent and was significantly associated with the anterior region of the mandible.
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Bridge health monitoring in the United States: A review
Rizzo, Piervincenzo,Enshaeian, Alireza Techno-Press 2021 Structural monitoring and maintenance Vol.8 No.1
The assessment of bridges' health has become a relevant component of the maintenance paradigm especially in those countries in which many structures are rated in poor condition and/or are over 50 years old. Additionally, the permanent monitoring of bridges helps engineers in validating the design prediction of bridge structural response to external loads. With more than 600,000 highway bridges, 46.4% of which rated as fair and 7.6% rated in poor condition, United States is one of those countries in which the installation of reliable bridge health monitoring systems is strategically necessary to minimize and optimize repair and rehabilitation costs and to minimize the risk of failures. In this paper, a thorough review of the scientific literature on structural health monitoring systems installed in U.S. bridges over the last 20 years is presented. This review aims to offer interested readers a holistic perspective of recent and current state-of-the-art bridge health monitoring systems and to extract a "general paradigm" that is common to many real structures. The review, conducted through a comprehensive search of peer-reviewed documents available in the scientific literature, discusses more than sixty bridges in terms of the instrumentation used, scope of the monitoring, and main outcomes. Overall, it was found that the monitoring systems provide a valuable tool to compare the structural responses predicted using analytical or numerical tools with the real response of the given structures. Owing to the relative short time span of the monitoring period, most of the monitoring systems did not flag any serious structural flaws that required the closure of the bridge monitored.
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Examination of experimental errors in Scanlan derivatives of a closed-box bridge deck
Rizzo, Fabio,Caracoglia, Luca Techno-Press 2018 Wind and Structures, An International Journal (WAS Vol.26 No.4
The objective of the investigation is the analysis of wind-tunnel experimental errors, associated with the measurement of aeroelastic coefficients of bridge decks (Scanlan flutter derivatives). A two-degree-of-freedom experimental apparatus is used for the measurement of flutter derivatives. A section model of a closed-box bridge deck is considered in this investigation. Identification is based on free-vibration aeroelastic tests and the Iterative Least Squares method. Experimental error investigation is carried out by repeating the measurements and acquisitions thirty times for each wind tunnel speed and configuration of the model. This operational procedure is proposed for analyzing the experimental variability of flutter derivatives. Several statistical quantities are examined; these quantities include the standard deviation and the empirical probability density function of the flutter derivatives at each wind speed. Moreover, the critical flutter speed of the setup is evaluated according to standard flutter theory by accounting for experimental variability. Since the probability distribution of flutter derivatives and critical flutter speed does not seem to obey a standard theoretical model, polynomial chaos expansion is proposed and used to represent the experimental variability.
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Piervincenzo Rizzo 대한의용생체공학회 2020 Biomedical Engineering Letters (BMEL) Vol.10 No.1
Dental implants and transcutaneous prostheses (trans-femoral implants) improve the quality of life of millions of peoplebecause they represent the optimal treatments to edentulism and amputation, respectively. The clinical procedures adoptedby surgeons to insert these implants are well established. However, there is uncertainty on the outcomes of the post-operationrecovery because of the uncertainty associated with the osseointegration process, which is defi ned as the direct, structural andfunctional contact between the living bone and the fi xture. To guarantee the long-term survivability of dental or trans-femoralimplants doctors sometimes implement non-invasive techniques to monitor and evaluate the progress of osseointegration. This may be done by measuring the stability of the fi xture or by assessing the quality of the bone-fi xture interface. In addition,care providers may need to quantify the structural integrity of the bone-implant system at various moments during thepatients recovery. The accuracy of such non-invasive methods reduce recovery and rehabilitation time, and may increasethe survival rate of the therapies with undisputable benefi ts for the patients. This paper provides a comprehensive review ofclinically-approved and emerging non-invasive methods to evaluate/monitor the osseointegration of dental and orthopedicimplants. A discussion about advantages and limitations of each method is provided based on the outcomes of the casespresented. The review on the emerging technologies covers the developments of the last decade, while the discussion aboutthe clinically approved systems focuses mostly on the latest (2017–2018) fi ndings. At last, the review also provides somesuggestions for future researches and developments in the area of implant monitoring.
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Prevalence of dental implant positioning errors: A cross-sectional study
Gabriel, Rizzo,Mayara Colpo, Prado,Lilian, Rigo Korean Academy of Oral and Maxillofacial Radiology 2022 Imaging Science in Dentistry Vol.52 No.-
Purpose: This study evaluated the prevalence of dental implant positioning errors and the most frequently affected oral regions. Materials and Methods: A sample was obtained of CBCT images of 590 dental implants from 230 individuals who underwent diagnosis at a radiology center using cone-beam computed tomography from 2017 to 2020. The following variables were considered: thread exposure, violation of the minimum distance between 2 adjacent implants and between the implant and tooth, and implant contact with anatomical structures. Descriptive data analysis and the Pearson chi-square test(P<0.05) were performed to compare findings according to mouth regions. Results: Most (74.4%) of the 590 implants were poorly positioned, with the posterior region of the maxilla being the region most frequently affected by errors. Among the variables analyzed, the most prevalent was thread exposure (54.7%), followed by implant contact with anatomical structures, violation of the recommended distance between 2 implants and violation of the recommended distance between the implant and teeth. Thread exposure was significantly associated with the anterior region of the mandible (P<0.05). The anterior region of the maxilla was associated with violation of the recommended tooth-implant distance (P<0.05) and the recommended distance between 2 adjacent implants(P<0.05). Implant contact with anatomical structures was significantly more likely to occur in the posterior region of the maxilla (P<0.05). Conclusion: Many implants were poorly positioned in the posterior region of the maxilla. Thread exposure was particularly frequent and was significantly associated with the anterior region of the mandible.
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