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Search Results: 1 - 10 of 2591 matches for " Luigi Rarità "
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Optimal Flows On Road Networks In Emergency Cases  [PDF]
Nicola Pasquino, Luigi Rarità
Open Journal of Applied Sciences (OJAppS) , 2012, DOI: 10.4236/ojapps.2012.24B014
Abstract: In this paper, we present a technique to redistribute car flows, described by a fluid dynamic model, on a portion of the Caltanissetta city, in Italy, when critical situations, such as car accidents, occur. Using a decentralized approach, a cost functional, that describes the asymptotic average velocity of emergency vehicles, is maximized with respect to distribution coefficients at simple junctions with two incoming roads and two outgoing ones. Then, in order to manage critical situations in high traffic conditions, local optimal coefficients at each node of the network are used. The overall traffic evolution is studied via simulations, that confirm the goodness of the optimization results. It is also proved that optimal coefficients allow a fast transit of emergency vehicles on assigned routes on the network.
Splitting of Traffic Flows to Control Congestion in Special Events
Ciro D'Apice,Rosanna Manzo,Luigi Rarità
International Journal of Mathematics and Mathematical Sciences , 2011, DOI: 10.1155/2011/563171
Abstract: We deal with the optimization of traffic flows distribution at road junctions with an incoming road and two outgoing ones, in order to manage special events which determine congestion phenomena. Using a fluid-dynamic model for the description of the car densities evolution, the attention is focused on a decentralized approach. Two cost functionals, measuring the kinetic energy and the average travelling times, weighted with the number of cars moving on roads, are considered. The first one is maximized with respect to the distribution coefficient, and the second is minimized with respect to the same control parameter. The obtained results have been tested by simulations of urban networks. Decongestion effects are also confirmed estimating the time a car needs to cross a fixed route on the network. 1. Introduction The vehicles congestion is one of the most important problem of modern cities, challenging many researchers to find techniques to control it. A solution to the problem is represented by the use of more lanes and the construction of crossings, but in many areas the solution is not feasible, and moreover the building and expanding of roads to accommodate the increase of vehicles is more expensive. In particular, the presence of unexpected heavy traffic in situations such as accidents leads to delay in the arrival of the emergency services and supplies to where they are needed. In the case of special events, escorts, closures of roads, traffic directions, and control functions can be performed, when necessary, to ensure the safe and efficient movement of vehicles, splitting the traffic flows at intersections in such way to improve the viability. An example is in Figure 1, where policemen are involved to manage traffic at junctions. Figure 1: Example of car flows redistribution. In this context, using a fluid dynamic model able to foresee the traffic density evolution on road networks (see [1–4]), we propose a strategy to redistribute in an optimal way flows at junctions. According to the adopted model, the car densities on each road follow a conservation law (see [5]), while dynamics at junctions is uniquely solved using the following rules:(A)the incoming traffic at a node is distributed to outgoing roads according to some distribution coefficients;(B)drivers behave so as to maximize the flux through the junction. If a junction is of type (namely, one incoming road, 1, and two outgoing ones, 2 and 3), rule (A) is expressed by a distribution parameter , indicating the percentage of cars going from road 1 to road 2. Assigning initial densities for
Optimal Paths on Urban Networks Using Travelling Times Prevision
Alfredo Cutolo,Carmine De Nicola,Rosanna Manzo,Luigi Rarità
Modelling and Simulation in Engineering , 2012, DOI: 10.1155/2012/564168
Abstract: We deal with an algorithm that, once origin and destination are fixed, individuates the route that permits to reach the destination in the shortest time, respecting an assigned maximal travel time, and with risks measure below a given threshold. A fluid dynamic model for road networks, according to initial car densities on roads and traffic coefficients at junctions, forecasts the future traffic evolution, giving dynamical weights to a constrained shortest path algorithm. Simulations are performed on a case study to test the efficiency of the proposed procedure.
DANTE’s Medical Knowledge: The Case of INFERNO, Canto XXX  [PDF]
Luigi Roffi
Advances in Historical Studies (AHS) , 2018, DOI: 10.4236/ahs.2018.71002

The Divine Comedy, by Dante Alighieri, describes an imaginative journey in afterlife. In Hell, canto XXX, Dante meets the falsifiers and sees a man who has the shape of a lute, a rotting face, and an abdomen bloated by “dropsy”. This horribly deformed sinner is Master Adam, who counterfeited Florentine money, and for this crime was burned at the stake. Previous critics had ascribed Master Adam’s punishment to various real or imaginary diseases, but an alternative possibility is that it may represent one of the most ancient, yet accurate, descriptions of tense ascites in the literature.

Security Engineering of SOA Applications Via Reliability Patterns  [PDF]
Luigi Coppolino, Luigi Romano, Valerio Vianello
Journal of Software Engineering and Applications (JSEA) , 2011, DOI: 10.4236/jsea.2011.41001
Abstract: Providing reliable compositions of Web Services is a challenging issue since the workflow architect often has only a limited control over the reliability of the composed services. The architect can instead achieve reliability by properly planning the workflow architecture. To this end he must be able to evaluate and compare the reliability of multiple architectural solutions. In this paper we present a useful tool which allows to conduct reliability analysis on planned workflows, as well as to compare the reliability of alternative solutions in a what-if analysis. The tool is implemented as a plug-in for the widely adopted Active BPEL Designer and exploits the concept of reliability pattern to evaluate the reliability formula of the workflow. The effectiveness of the approach and the operation of the tool are demonstrated with respect to a case study of a business security infrastructure realized by orchestrating simple security services.
Altruism, Selfishness and Social Cohesion  [PDF]
Antonio Luigi Paolilli
Sociology Mind (SM) , 2011, DOI: 10.4236/sm.2011.14018
Abstract: Recently has been shown that, given certain conditions, altruism can prevail in a population even without the help of mechanisms as kin selection, reciprocal altruism and group selection. At the light of this hypothesis, it is shown how altruism and cooperative aptitudes can favor the concentration of a population and how an (incomplete) evolution of altruism, caused by group selection, into the Benthamian form, determining the emergence of sentiments and behaviors, such as a sense of justice, as well as envy and gossip, can lead to the formation of a regulated society. From this standpoint, altruism leads to group selection, and not the contrary.
Clinical, radiological and histological diagnoses of periapical periodontitis spreading to the adjacent tooth: A case of endodontic failure  [PDF]
Luigi Cianconi, Manuele Mancini
Open Journal of Stomatology (OJST) , 2013, DOI: 10.4236/ojst.2013.35048

Aims: This article describes the apical infection in endodontically treated tooth 4.5 that spread to adjacent tooth 4.4. Case Report: A 52-year-old woman was referred for the presence of radiolucency extending from tooth 4.5 and mental foramen. Spontaneous symptoms were present. Tooth 4.5 showed poor-quality endodontics. The vitality of tooth 4.4 was negative, even though no mechanical trauma had been reported, nor was caries present. Both teeth were sensitive to percussion. Endodontic re-treatment of 4.5 and endodontic treatment of 4.4 were performed in a single visit. A large amount of endodontic sealer squeezed mesially from the root of tooth 4.5, where a partial horizontal root fracture was hypothesized. 6-, 12-, and 18-month radiographic follow-ups, by both periapical and cone-beam computed tomography (CBCT) analyses, showed incomplete osseous healing. CBCT excluded root fracture on 4.5. Local symptoms were still present. Clinical and radiological conditions led to extractions, and a cystic lesion was enucleated for histopathologic analyses. Histopathologic diagnosis was a periapical cyst. The supposed partial horizontal root fracture of 4.5 was actually a large lateral canal. Although the root canal treatments followed high standards in terms of quality, a persistent chronic infection developed histologically. The cystic lesion was one consistent reason for the unsuccessful healing of 4.5.

Learning from experience: A simple effective protocol to test footwear prescriptions for the Diabetic foot by using the Pedar system  [PDF]
Claudia Giacomozzi, Luigi Uccioli
Journal of Biomedical Science and Engineering (JBiSE) , 2013, DOI: 10.4236/jbise.2013.65A008

Adherence of patients to treatment and appropriateness of prescribed footwear are mandatory for successful prevention of Diabetic foot ulceration. In a Public Healthcare Service, footwear approval is under the responsibility of the clinician. In some cases kinetic measurements are taken inside the shoes to support the clinical decision; however, an overall agreement is still missing with respect to a simple, reliable and effective test protocol based on proper threshold values. Authors’ past experiences, specific needs of the Diabetic outpatient service, and suggestions from valuable literature led to an instrumental test protocol based on reference peak pressure (PP) thresholds and gait line (GL) specific for each level of risk. Permission was obtained for one preliminary validation session at the Authors’ outpatient service, during which 11 patients at high/very high risk of ulceration were examined—9 for testing new footwear, 2 for monitoring 12-month-old footwear. The protocol was well accepted by patients and operators, fast and easy to be used. Based on the instrumental, clinical and visual inspection data; 4 new footwear did not pass the test; 5 passed the test but integration or minor changes were requested; the 2 old footwear were found no more effective. As a first positive feedback, after 4 months of wearing the modified prescriptions none of the patients had developed plantar ulcers or signs of tissue damage. Successive data processing proved that in all patients altered PPs and deviated GLs did correlate with alterations of other kinetic parameters. The protocol, which is proved to be sensitive and valuable for the Diabetic foot care, may have a general validity; the delivered specific PP thresholds and reference data, instead, can be reliably used if the test is performed with a calibrated Pedar Insole System and with the wide Insoles in the range UW-YW (EU size 36 - 45).

SEM evaluation of apical intraradicular dentine cleanliness and degree of erosion after the application of three irrigating solutions  [PDF]
Manuele Mancini, Luigi Cianconi
Open Journal of Stomatology (OJST) , 2013, DOI: 10.4236/ojst.2013.32030

Aims: The aim of the study was to compare the efficacy of 37% phosphoric acid, 12% nitric acid, 17% EDTA in endodontic smear layer removal and degree of erosion in the apical third of endodontic canals. Methods and Material: One hundred and four extracted single-rooted human teeth were randomized into four groups (n = 26) and instrumented using ProTaper Universal Ni-Ti rotary instruments. Each canal was irrigated with one of the following solutions: 37% phosphoric acid, 12% nitric acid, 17% EDTA, 5.25% NaOCl (control). All specimens were then irrigated with 5 mL distilled water and dried with sterile paper points. Kruskal-Wallis and Mann-WhitneyU statistical tests were used. Results: Scanning electron microscopy (SEM) evaluation showed no significant differences among test reagents in smear layer removal. However, the efficacy of 12% nitric acid and 17% EDTA in removing the smear layer was significantly greater than 5.25% NaOCl (control). Degree of erosion could not be evaluated. Conclusion: Protocols used in this study were not sufficient to completely remove the smear layer in the apical third of shaped root canals.

Economic and Cultural Peripheralization in the Eurozone  [PDF]
Antonio Luigi Paolilli
Sociology Mind (SM) , 2014, DOI: 10.4236/sm.2014.41006

In this paper, we will discuss the reasonableness of the decision by Italy and other southern and western EU states to become members of the eurozone. We will also discuss whether this economic choice can be socially and culturally sustainable in a Europe characterized by cultures which, despite their shared substratum, are in competition with each other.

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