Cyclic mechanical model of semirigid top and seat and double web angle connections

Raffaele Pucinotti 국제구조공학회 2006 Steel and Composite Structures, An International J Vol.6 No.2

In this paper, a cyclic mechanical model is presented to simulate the behaviour of top and seat with web angle beam-to-column connections. The introduced mechanical model is compared with Eurocode 3 Annex J, its extension, and with experimental data. To have a better insight regarding the actual response of the joints, available results of the experiments, carried out on full-scale top and seat angle joints under monotonic and cyclic loading, are first considered. Subsequently, a finite element model of the test setup is developed. The application of the proposed model, its comparisons with the experimental curves and with the Eurocode 3 Annex J and with its modification, clearly show the excellent quality of the model proposed.

Structural optimization of lattice cellular structures: incorporating the fatigue strength dependency on the building orientation of sub-unit struts

Raffaele De Biasi,Simone Murchio,Matteo Benedetti 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3

Additive manufacturing (AM) techniques are widely involved in the production of lattice-based prosthetic devices. Nevertheless, the development of implants with improved fatigue resistance is still an open debate. In lattice structures, the fatigue life of a component is a crucial issue, since it is not only strongly affected by the wide variety of manufacturinginduced defects but also by the specimen building direction. To gain a better comprehension of fatigue in AM, an investigation of sub-unit lattice elements according to their building orientation should be addressed. Additionally, this knowledge can be exploited to design a fatigueoptimized component. In this work, the authors propose a combined approach of fatigue experimental tests on sub-unit lattice elements along with optimization strategies for a wise design and fabrication of a Ti6Al4V laser powder bed fusion (L-PBF) octet truss lattice component. The specimen orientation with respect to the printing plane is chosen as the optimization variable.

Creative networks in Florence and Paris: empirical results on project networks

Raffaele Donvito,Gaetano Aiello,Silvia Ranfagni 한국마케팅과학회 2013 마케팅과학연구 Vol.23 No.4

This article addresses the topic of creativity at the geographic territory level from a network perspective. Its objective is to propose an innovative representational model of creative networks in geographical territories that is suitable for analyzing the process of the management of creativity. This model aims to go beyond the boundaries of the creative industries (Florida,2002; Stolarick & Florida, 2005) by identifying specific territorial networks with creative content. The new perspective adopted is based on the construction of project networks (Ramos & Ford, 2009). In order to identify territorially-based creative project networks, the authors utilize the concept of the network mobilizer (Mouzas &Naude´, 2007). Some managerial implications derive from the proposed model. With it, actors involved in territorial networks enhance their capabilities to know their network position and their contribution to creativity generation. The empirical research involves the territories of Florence and Paris, which historically have been distinguished by creativity. These territories are analyzed with a focus on high symbolic value goods. The methodology is based on face-to-face indepth interviews with 10 network mobilizers. Through the perceptions of these network mobilizers, 15 project networks have been discovered. These project networks have been recreated based on the network picture (Ford & Redwood, 2005) outlined by the same mobilizers. The approach of this article is to focus on the creative content of the network interactions, rather than on the analysis of phenomena correlated with actors in the creative industries (Cooke & Lazzeretti, 2008; Lazzeretti, Boix, & Capone, 2008)linked to a territory. The perspective adopted in the model is based on the construction of project networks (Ramos & Ford, 2009), that is to say networks in which several actors participate, with the aim of realizing a specific, shared project. In order to identify territorially-based creative project networks, the authors utilize the concept of the network mobilizer (Mouzas & Naude´, 2007), that is, those particular actors who assume the position of network activator through the process of mobilization of activities and resources. The main theoretical result of the research is the generation of an innovative model for representing creativity at a territorial level that integrates a mainly qualitative analysis perspective together with quantitative tools. Some relevant managerial implications derive from the proposed model. With it, actors involved in territorial networks enhance their capabilities to know their specific network position and their contribution to creativity generation. It leads to a more acknowledged development of network relations, where actors increase their capabilities to shape a set of activities and resources to share within the network in order to strengthen creativity. The empirical research refers to the territories of Florence and Paris, which historically have been distinguished by creativity. In both territories, potential network mobilizers have been identified by the authors. Through the perceptions of these network mobilizers, project networks with potential implications for the Florentine and Parisian territories have been discovered and investigated. These project networks have been individually recreated based on the network picture (Ford & Redwood, 2005)outlined by these same mobilizers. The methodology is based on face-to-face in-depth interviews with 10 potential network mobilizers.

Atypical Presentation of Acetylcholinesterase Inhibitor-Induced Diarrhea in Older Adults with Cognitive Decline: An Aspect not to be Underestimated

Raffaele Pagliuca,Mario Virgilio Papa,Pagliuca Mena Ilaria,Virginia Federica Papa,Gina Varricchio 대한노인병학회 2023 Annals of geriatric medicine and research Vol.27 No.1

The rivastigmine patch is the only existing transdermal delivery system used for the treatment of Alzheimer disease. Among the most common adverse events derived from its use are gastrointestinal events, particularly diarrhea. We report a clinical case of an 81-year-old patient admitted to our hospital under long-standing treatment with rivastigmine transdermal patch who presented with atypical watery diarrhea. Anamnesis showed that the patient presented with a likely infectious gastroenteric event, the diarrheal symptoms of which persisted upon resolution of the event and resolved only upon temporary discontinuation of acetylcholinesterase inhibitors. Failure to rapidly identify the causes of profuse diarrhea in older adults can have lethal consequences. When these symptoms occur, quickly recognizing the causes and providing proper management can be lifesaving.

A Novel’s Structure as a Complex System

Raffaele Calabretta 대한사고개발학회 2013 The International Journal of Creativity & Problem Vol.23 No.2

The purpose of this paper is to present the complex structure of the book “The movie of emotions”. This structure is not organized into chapters and is characterized by several beginnings and conclusions, is branched, fractalic, duplicated, modular and specialized. If one wants to define a specific novel as a complex system, then that novel has obviously to be not only complex but also “interesting” for readers. “The movie of emotions” is a very experimental novel that can be defined both complex and interesting. It can be defined as complex because its structure reproduces some properties of complex systems, and because the amount of information necessary to describe its multiple levels of structure organization is big and has to do with different literary styles and registers. It can be defined as interesting on the basis of reviews. The book is a “structural science-in-fiction novel”, a new literary genre in which novel’s structure communicates scientific information. By reading this novel, readers follow the main character’s attempts to write a scientific paper on emotions, then the script of a movie, and to eventually turn the latter into a novel. They learn implicit and explicit knowledge about psychology and neuro-psychology of emotions, cognitive science and theory of complex systems.

Whole Spine Segmentation Using Object Detection and Semantic Segmentation

Raffaele Da Mutten,Olivier Zanier,Sven Theiler,유승준,Luca Regli,Carlo Serra,Victor E. Staartjes 대한척추신경외과학회 2024 Neurospine Vol.21 No.1

Objective: Virtual and augmented reality have enjoyed increased attention in spine surgery. Preoperative planning, pedicle screw placement, and surgical training are among the most studied use cases. Identifying osseous structures is a key aspect of navigating a 3-dimensional virtual reconstruction. To automate the otherwise time-consuming process of labeling vertebrae on each slice individually, we propose a fully automated pipeline that automates segmentation on computed tomography (CT) and which can form the basis for further virtual or augmented reality application and radiomic analysis. Methods: Based on a large public dataset of annotated vertebral CT scans, we first trained a YOLOv8m (You-Only-Look-Once algorithm, Version 8 and size medium) to detect each vertebra individually. On the then cropped images, a 2D-U-Net was developed and externally validated on 2 different public datasets. Results: Two hundred fourteen CT scans (cervical, thoracic, or lumbar spine) were used for model training, and 40 scans were used for external validation. Vertebra recognition achieved a mAP50 (mean average precision with Jaccard threshold of 0.5) of over 0.84, and the segmentation algorithm attained a mean Dice score of 0.75 ± 0.14 at internal, 0.77 ± 0.12 and 0.82 ± 0.14 at external validation, respectively. Conclusion: We propose a 2-stage approach consisting of single vertebra labeling by an object detection algorithm followed by semantic segmentation. In our externally validated pilot study, we demonstrate robust performance for our object detection network in identifying individual vertebrae, as well as for our segmentation model in precisely delineating the bony structures.

Renaissance of marketing and management in fashion

Raffaele Donvito 한국마케팅과학회 2018 Journal of Global Fashion Marketing Vol.9 No.3

This special issue was jointly conceived together with the 2015 Global Fashion Management Conference at Florence entitled “Renaissance of Marketing and Management in Fashion” organized by the Global Alliance of Marketing & Management Associations and co-hosted by the Italian Marketing Society (SIMktg), the International Textile and Apparel Association, the Korean Scholars of Marketing Science, and the University of Florence. This article aims to inspire scholars and practitioners activating a dynamic dialogue between Renaissance facets and the results of contemporary research about luxury fashion marketing phenomenon presented in this special issue (i.e. luxury fashion branding, product, pricing, communication, and social media).

Acute Symptomatic Seizures Caused by Electrolyte Disturbances

Raffaele Nardone,Francesco Brigo,Eugen Trinka 대한신경과학회 2016 Journal of Clinical Neurology Vol.12 No.1

In this narrative review we focus on acute symptomatic seizures occurring in subjects with electrolyte disturbances. Quite surprisingly, despite its clinical relevance, this issue has received very little attention in the scientifc literature. Electrolyte abnormalities are commonly encountered in clinical daily practice, and their diagnosis relies on routine laboratory fndings. Acute and severe electrolyte imbalances can manifest with seizures, which may be the sole presenting symptom. Seizures are more frequently observed in patients with sodium disorders (especially hyponatremia), hypocalcemia, and hypomagnesemia. Tey do not entail a diagnosis of epilepsy, but are classifed as acute symptomatic seizures. EEG has little specifcity in differentiating between various electrolyte disturbances. Te prominent EEG feature is slowing of the normal background activity, although other EEG fndings, including various epileptiform abnormalities may occur. An accurate and prompt diagnosis should be established for a successful management of seizures, as rapid identifcation and correction of the underlying electrolyte disturbance (rather than an antiepileptic treatment) are of crucial importance in the control of seizures and prevention of permanent brain damage.

ANTECEDENTS OF TRUST TOWARDS ONLINE SHOPPING IN CHINA AND SAUDI ARABIA. THE MODERATING ROLE OF DISPOSITION TO TRUST

Raffaele Filieri,Lala Hu,Saleh Bazi 글로벌지식마케팅경영학회 2020 Global Marketing Conference Vol.2020 No.11

Prediction of morphological changes of catalyst materials under reaction conditions by combined <i>ab initio</i> thermodynamics and microkinetic modelling

Cheula, Raffaele,Soon, Aloysius,Maestri, Matteo Royal Society of Chemistry 2018 Catalysis science & technology Vol.8 No.14

<▼1><P>Microkinetic modeling, <I>ab initio</I> thermodynamics and Wulff–Kaishew construction are used to predict catalyst structural changes under reaction conditions.</P></▼1><▼2><P>In this article, we couple microkinetic modelling, <I>ab initio</I> thermodynamics and Wulff–Kaishew construction to describe the structural variation of catalyst materials as a function of the chemical potential in the reactor. We focus specifically on experiments of catalytic partial oxidation (CPO) of methane on Rh/α-Al<SUB>2</SUB>O<SUB>3</SUB>. We employ a detailed structureless microkinetic model to calculate the profiles of the gaseous species molar fractions along the reactor coordinate and to select the most abundant reaction intermediates (MARIs) populating the catalyst surfaces in different zones of the reactor. Then, we calculate the most stable bulk and surface structures of the catalyst under different conditions of the reaction environment with density functional theory (DFT) calculations and <I>ab initio</I> thermodynamics, considering the presence of the MARIs on the catalyst surface in thermodynamic equilibrium with the partial pressures of their reservoirs in the gas phase surrounding the catalyst. Finally, we exploit the Wulff–Kaishew construction method to estimate the three-dimensional shape of the catalyst nanoparticles and the distribution of the active sites along the reactor coordinate. We find that the catalyst drastically modifies its morphology during CPO reaction by undergoing phase transition, in agreement with spectroscopy studies reported in the literature. The framework is also successfully applied for the analysis and interpretation of chemisorption experiments for catalyst characterization. These results demonstrate the crucial importance of rigorously accounting for the structural effect in microkinetic modeling simulations and pave the way towards the development of structure-dependent microkinetic analysis of catalytic processes.</P></▼2>