152 research outputs found
QoE in Pull Based P2P-TV Systems: Overlay Topology Design Tradeoff
AbstractâThis paper presents a systematic performance anal-ysis of pull P2P video streaming systems for live applications, providing guidelines for the design of the overlay topology and the chunk scheduling algorithm. The contribution of the paper is threefold: 1) we propose a realistic simulative model of the system that represents the effects of access bandwidth heterogeneity, latencies, peculiar characteristics of the video, while still guaranteeing good scalability properties; 2) we propose a new latency/bandwidth-aware overlay topology design strategy that improves application layer performance while reducing the underlying transport network stress; 3) we investigate the impact of chunk scheduling algorithms that explicitly exploit properties of encoded video. Results show that our proposal jointly improves the actual Quality of Experience of users and reduces the cost the transport network has to support. I
Clinical, Histological and Trichoscopic Correlations in Scalp Disorders
Trichoscopy is the term coined for the dermoscopic imaging of scalp and hair. This diagnostic technique, simple and noninvasive, can be used as a handy bedside tool for the diagnosis and follow-up of hair and scalp disorders. It allows the recognition of morphologic structures not visible by the naked eye and provides the clinician with a range of dermoscopic findings necessary for differential diagnosis. Trichoscopy observation can be broadly grouped as interfollicular patterns and follicular patterns. Recently, a third mixed class, called the follicular plus interfollicular pattern, has been introduced. Some of these features are specific to a certain scalp disease, while others can be found in many hair disorders. Although studies suggest that the use of trichoscopy can improve clinical accuracy, further investigation is needed. This review provides update information on the trichoscopic features of the most common scalp disorders, striving to show a histopathological and clinical correlation
fem and ann combined approach for predicting pressure source parameters at etna volcano
Abstract. A hybrid approach for forward and inverse geophysical modeling, based on Artificial Neural Networks (ANN) and Finite Element Method (FEM), is proposed in order to properly identify the parameters of volcanic pressure sources from geophysical observations at ground surface. The neural network is trained and tested with a set of patterns obtained by the solutions of numerical models based on FEM. The geophysical changes caused by magmatic pressure sources were computed developing a 3-D FEM model with the aim to include the effects of topography and medium heterogeneities at Etna volcano. ANNs are used to interpolate the complex non linear relation between geophysical observations and source parameters both for forward and inverse modeling. The results show that the combination of neural networks and FEM is a powerful tool for a straightforward and accurate estimation of source parameters in volcanic regions
FEM and ANN combined approach for predicting pressure source
A hybrid approach for forward and inverse geophysical
modeling, based on Artificial Neural Networks
(ANN) and Finite Element Method (FEM), is proposed in
order to properly identify the parameters of volcanic pressure
sources from geophysical observations at ground surface.
The neural network is trained and tested with a set of
patterns obtained by the solutions of numerical models based
on FEM. The geophysical changes caused by magmatic pressure
sources were computed developing a 3-D FEM model
with the aim to include the effects of topography and medium
heterogeneities at Etna volcano. ANNs are used to interpolate
the complex non linear relation between geophysical observations
and source parameters both for forward and inverse
modeling. The results show that the combination of
neural networks and FEM is a powerful tool for a straightforward
and accurate estimation of source parameters in volcanic
regions
Numerical Model and Experimental Analysis of the Thermal Behavior of Electric Radiant Heating Panels
Electric radiant heating panels are frequently selected during the design phase of residential
and industrial heating systems, especially for retrofit of existing buildings, as an alternative to other
common heating systems, such as radiators or air conditioners. The possibility of saving living
and working space and the ease of installation are the main advantages of electric radiant solutions.
This paper investigates the thermal performance of a typical electric radiant panel. A climatic room was equipped with temperature sensors and heat flow meters to perform a steady state experimental analysis. For the dynamic behavior, a mathematical model was created and compared to a thermographic measurement procedure. The results showed for the steady state an efficiency of energy transformation close to one, while in a transient thermal regime the time constant to reach the steady state condition was slightly faster than the typical ones of hydronic systems
Gli studenti portano la scienza nello Spazio
Il progetto XenoGRISS ha vinto il bando dellâAgenzia Spaziale Italiana (ASI) YiSS - Youth ISS Science 2019 ed Ăš stato condotto sulla Stazione Spaziale Internazionale (ISS) dallâastronauta Luca Parmitano nel dicembre 2019 durante la missione "Beyond".
XenoGRISS, che ha scopi sia scientifici che educativi, Ăš stato progettato e presentato congiuntamente da ricercatori delle UniversitĂ degli Studi di Milano e Firenze, da un gruppo di 9 studenti dellâITIS A. Meucci di Firenze e da tre insegnanti dello stesso Istituto. Gli studenti sono stati coinvolti nello studio della crescita e della rigenerazione dei girini di Xenopus laevis in assenza di gravitĂ e hanno affrontato sia gli aspetti scientifico-biologici dell'esperimento sia quelli tecnologici relativi allâhardware necessario al mantenimento dei girini per 30 giorni nello Spazio e alle rilevazioni scientifiche
Italian Guidelines in diagnosis and treatment of alopecia areata
Alopecia areata (AA) is an organ-specific autoimmune disorder that targets anagen phase hair follicles. The course is unpredictable and current available treatments have variable efficacy. Nowadays, there is relatively little evidence on treatment of AA from well-designed clinical trials. Moreover, none of the treatments or devices commonly used to treat AA are specifically approved by the Food and Drug Administration. The Italian Study Group for Cutaneous Annexial Disease of the Italian Society of dermatology proposes these Italian guidelines for diagnosis and treatment of Alopecia Areata deeming useful for the daily management of the disease. This article summarizes evidence-based treatment associated with expert-based recommendations
Diversity and ethics in trauma and acute care surgery teams: results from an international survey
Background Investigating the context of trauma and acute care surgery, the article aims at understanding the factors that can enhance some ethical aspects, namely the importance of patient consent, the perceptiveness of the ethical role of the trauma leader, and the perceived importance of ethics as an educational subject. Methods The article employs an international questionnaire promoted by the World Society of Emergency Surgery. Results Through the analysis of 402 fully filled questionnaires by surgeons from 72 different countries, the three main ethical topics are investigated through the lens of gender, membership of an academic or non-academic institution, an official trauma team, and a diverse group. In general terms, results highlight greater attention paid by surgeons belonging to academic institutions, official trauma teams, and diverse groups. Conclusions Our results underline that some organizational factors (e.g., the fact that the team belongs to a university context or is more diverse) might lead to the development of a higher sensibility on ethical matters. Embracing cultural diversity forces trauma teams to deal with different mindsets. Organizations should, therefore, consider those elements in defining their organizational procedures. Level of evidence Trauma and acute care teams work under tremendous pressure and complex circumstances, with their members needing to make ethical decisions quickly. The international survey allowed to shed light on how team assembly decisions might represent an opportunity to coordinate team member actions and increase performance
- âŠ