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Search Results: 1 - 10 of 6059 matches for " Stefano Lucchina "
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False aneurysm of the interosseous artery and anterior interosseous syndrome - an unusual complication of penetrating injury of the forearm: a case report
Ramon Pini, Stefano Lucchina, Guido Garavaglia, Cesare Fusetti
Journal of Orthopaedic Surgery and Research , 2009, DOI: 10.1186/1749-799x-4-44
Abstract: This case highlights the potential vascular and neurological hazards of minimal penetrating injury of the proximal forearm and emphasizes the phenomenon of delayed presentation of vascular injuries following seemingly obscure penetrating wounds.We report a case of a 22-year-old male admitted for a minimal penetrating trauma of the proximal forearm that, some days later, developed an anterior interosseous syndrome. A Duplex study performed immediately after the trauma was normal. Further radiologic investigations i.e. a computer-tomographic-angiography (CTA) revealed a false aneurysm of the proximal portion of the interosseous artery (IA). Endovascular management was proposed but a spontaneous rupture dictated surgical revision with simple excision. Complete neurological recovery was documented at 4 months postoperatively.After every penetrating injury of the proximal forearm we propose routinely a detailed neurological and vascular status and a CTA if Duplex evaluation is negative.Penetrating isolated lesions of the interosseous anterior neurovascular bundle are rare. We report the case of a 22-year-old male who sustained such a lesion with formation of a false aneurysm of the proximal portion of the interosseous artery (IA). A review of the literature showed one similar case of infective origin so that our description is the first of post-traumatic vascular compression of the anterior interosseous nerve (AIN) [1].A 22 year old male sustained a penetrating injury of the forearm, after falling into a glass window during his stay in the Far East. The initial haemorrhage was treated with a simple compression. X-ray showed a small glass-like foreign body (fig. 1). A Duplex study was apparently normal. A few days later, he developed a rapidly complete sensory deficit on the median nerve and a loss of motor function on the AIN. No specific therapy or further investigation was proposed to the patient, who, back home 4 weeks later, consulted our unit. An established ischemi
Clinical results of the Harris-Galante cup implanted from 1986 to 1991
Antonio Croce,Emilio Mazza,Stefano Lucchina,Andrea Panzeri,Simone Gatti
Journal of Orthopaedics and Traumatology , 2000, DOI: 10.1007/s101950070014
Abstract: In the period 1986–1991, we performed 370 consecutive total hip arthroplasties (THA) using the Harris-Galante porus coated prosthesis. The characteristics of this component are: a fiber-mesh coating in pure Ti alloy that stimulates osteoinduction, a process of fusion of fiber-mesh to the metal back that reduces potential damage to the microstructure of the fibers with consequently less resistance to fatigue and a better primary stability guaranteed by fixation screws that stimulate osteoconduction. The average follow-up was 11.5 years. The follow-up was performed through a roentgenographic control at 3, 6 and 12 months and then once a year. Mineralometric evaluation with a Hoxologic QDR apparatus [1,2] permitted quantitative examination of the periprosthetic bonestock. A questionnaire was administered to examine the characteristics of pain and the ability to perform daily activities, to go upstairs, to walk distances, to sit the down and to put on socks and shoes. We found no vascular complications because of the use of Ti screws; the cup, after a primary fixation, ran into osteointegration in most cases. We did not find any aseptic loosening due to the inadequate primary press-fit or to screw breaking. We did not find any periprosthetic bone loss due to the migration of Ultra High Molecular Weight Polyethylene (UHMWPE) wear particles from holes of the shell. When aseptic loosening of the femoral stem and UHMWPE wear particle formation did occur, the metal back was perfectiyl osteointegrated and we only had to substitute the insert. The results are clinically interesting considering the long-term follow-up, the large number of patients and, technically, the type of fixation (line-to-line without press-fit), the semplicity of assembly of UHMWPE without any bone loss around the cup, the good fixation of cups even if badly implanted because of other difficulties in impanting them or for a wrong technique. In our opinion, our choice of implanting HG1 cups line-to-line was successful 10–15 years later.
Feasibility Evaluation of Integrating UsabilityEngineering Issues in a Design for Multi-XCollaborative Framework  [PDF]
Stefano Filippi
Intelligent Information Management (IIM) , 2011, DOI: 10.4236/iim.2011.31004
Abstract: Design for manufacturing, design for assembly, and, in general, design for X, are methods helping an effective generation of industrial products. In parallel with the development of these methods, the research about usability engineering has generated many important results, both from the design, and the evaluation and testing points of view. The research described in this paper aims at evaluating the feasibility of the integration of two new usability methods, the design for innovative usability - DFIU -, and the integrated method for usability evaluation and testing - IMUET -, in an existing design for X named design guidelines collaborative framework - DGLs-CF -. Indeed, the DGLs-CF is a design for multi-X method, given that it covers both the manufacturing and the verification phases of the industrial product lifecycle. All these methods are currently under development by the author’s research group. To evaluate this feasibility, the first task of the research aims at describing and classifying the components of the three methods. Next, these components are semantically related to each other. Finally, the last activity verifies the compatibility between the components of the two usability methods and the data structures of the DGLs-CF to check the feasibility from the implementation point of view. The result of this research will consist of precise indications both for the development of a design for multi-X collaborative framework covering homogeneously the design, manufacturing, verification, and use phases of the industrial product lifecycle, and to be used as a reference for researchers interested in considering the integration of usability issues in their design tools, methods, and processes.
A General Purpose Analysis Package  [PDF]
Stefano Federico
Atmospheric and Climate Sciences (ACS) , 2012, DOI: 10.4236/acs.2012.22022
Abstract: This paper presents a general-purpose analysis package able to solve two- and three- dimensional analysis problems. The system can use the following methods of solution: Successive Approximation (SA), Optimal Interpolation (OI), and 3D-Var. Analyses are given for the following parameters: zonal and meridional wind components, temperature, relative humidity, and geopotential height. The analysis package was applied to produce analyses at 6 h time interval for the period 1-11 August 2008. The period was selected for data availability and forty-one analyses were collected. The results show the validity of the different solutions, which can be chosen depending on the physical problem to solve and on the computational resources available. In particular, assuming the observations as the reference, all solutions show a decrease of the RMSE compared to the background. The decrease is consistent with the particular setting of the analysis system used in this paper. The comparison between different solutions shows that the SA converges to OI in few iterations, and that the SA solution with ten iteration is, in practice, equal to OI. Moreover, the 3D-Var method shows its potential to improve the analysis, once the horizontal and vertical length-scales and the background and observational errors are set optimally, because its solution may be sizeably different from two-dimensional methods.
Preliminary Results of a Data Assimilation System  [PDF]
Stefano Federico
Atmospheric and Climate Sciences (ACS) , 2013, DOI: 10.4236/acs.2013.31009
Abstract:

A data assimilation system combines all available information on the atmospheric state in a given time-window to produce an estimate of atmospheric conditions valid at a prescribed analysis time. Nowadays, increased computing power coupled with greater access to real-time asynoptic data is paving the way toward a new generation of high-resolution (i.e. on the order of 10 km) operational mesoscale analyses and forecasting systems. Moreover, better initial conditions are increasingly considered of the utmost importance for Numerical Weather Prediction (NWP) at the short range (0 - 12 h). This paper presents a general-purpose data assimilation system, which is coupled with the Regional Atmospheric Modelling System (RAMS) to give the analyses for: zonal and meridional wind components, temperature, relative humidity, and geopotential height. In order to show its potential, the data assimilation systems applied to produce analyses over Central Europe. For this application the background field is given by a short-range forecast (12 h) of the RAMS and analyses are produced by 2D-Var with 0.25? horizontal resolution. Results show the validity of the analyses because they are closer to the observations, consistently with the settings of the data assimilation system. To quantify the impact of improved initial conditions on the forecast, the analyses are then used as initial conditions of a short-range (6 h) forecast of the RAMS model. The results show that the RMSE is effectively reduced for the one- and two hours forecast, with some improvement for the three-hours forecast.

Continued Fractions and Dynamics  [PDF]
Stefano Isola
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.57101
Abstract:

Several links between continued fractions and classical and less classical constructions in dynamical systems theory are presented and discussed.


Revealed Cores: Characterizations and Structure  [PDF]
Stefano Vannucci
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.614200
Abstract: Characterizations of the classes of all choice functions that select the cores or the externally stable cores induced by an underlying revealed dominance digraph are provided. Relying on such characterizations, the basic order-theoretic structure of the corresponding sets of revealed cores is also analyzed. In particular, it is shown that the poset of all revealed cores ordered by set inclusion is a median meet semilattice: therefore, any profile of revealed cores may be aggregated by means of the simple majority rule.
Italian Banks’ Paths through the Crisis  [PDF]
Stefano Zedda
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.73026
Abstract: Over the past seven years, the financial system has undergone an unprecedented crisis, which has caused important changes in the structure and business models of banks. This paper explores the main changes in the structure of Italian banks’ assets in 2007-2013, by size and category, as a result of the financial crisis and of regulatory and business models changes. The analysis shows that the effects of the crisis were very different on different categories, and that business models have changed, pushing the different banking categories to business models and balances increasingly similar.
Using Rapid Prototyping Data to Enhance a Knowledge-Based Framework for Product Redesign  [PDF]
Stefano FILIPPI, Ilaria CRISTOFOLINI
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.21001
Abstract: The particular characteristics of Rapid Prototyping technologies, both in terms of constrains and opportunities, often require the reconfiguration of the product model to obtain the best compliance with the product functionalities and performances. Within this field of research, a knowledge-based tool named Design GuideLines Collaborative Framework (DGLs-CF) was developed to support both the designers defining the product consistently with the manufacturing technologies and the manufacturers defining the building setup consistently with the product requirements. Present work is focused on enhancing the DGLs-CF knowledge base and on updating the DGLs-CF knowledge management by using the information gathered on some RP technologies. The added-value of this research is represented by an improvement in the Redesign/Reconfig- uration Package, the final result of the DGLs-CF adoption. This is a list of actions to be performed on the product model and on the process parameters to avoid the limitations of the technology and to exploit at best its opportunities.
Time Representation in Economics  [PDF]
Stefano Bosi, Lionel Ragot
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.21002
Abstract: In this paper, we study general polynomial discretizations in backward and forward looking, and the preservation of stability properties. We apply these results to the Ramsey model [4]. Its discrete-time version is a hybrid discretizations of a backward-looking budget constraint and a forward-looking Euler equation. Saddle-path stability is a robust property under discretization.
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