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POPULATING A LIBRARY OF REUSABLE H-BOMS: ASSESSMENT OF A FEASIBLE IMAGE BASED MODELING WORKFLOW
No full textThe paper shows the intermediate results of a research activity aimed at populating a library of reusable Historical Building Object Models (H-BOMs) by testing a full digital workflow that takes advantages from using Structure from Motion (SfM) models and is centered on the geometrical/stylistic/materic analysis of the architectural element (portal, window, altar). The aim is to find common (invariant) and uncommon (variant) features in terms of identification of architectural parts and their relationships, geometrical rules, dimensions and proportions, construction materials and measure units, in order to model archetypal shapes from which it is possible to derive all the style variations. At this regard, a set of 14th - 16th century gothic portals of the catalan-aragonese architecture in Etnean area of Eastern Sicily has been studied and used to assess the feasibility of the identified workflow. This approach tries to answer the increasingly demand for guidelines and standards in the field of Cultural Heritage Conservation to create and manage semantic-aware 3D models able to include all the information (both geometrical and alphanumerical ones) concerning historical buildings and able to be reused in several projects
On the establishment of trust in the cloud-based ETSI NFV framework
No full textThis paper discusses the open issues in incorporating trust techniques in the NFV environment specified by the ETSI NFV Industry Specification Group, and it analyses available technologies to fill this gap. ETSI is developing security and trust specifications within its NFV-SEC working group, with the aim of establishing and assessing trust of both the hardware platform and the virtualised infrastructure hosting the Virtual Network Functions. Cloud computing, envisioned by ETSI as enabling technology for the deployment of the NFV infrastructure, represents a challenging environment for the establishment of trust. Open issues in this area include applicability of hardware-based trust assessment to a virtualised infrastructure, and integrity and privacy of virtual instances hosted on a multi-tenant platform. This paper discusses the challenges in applying one specific technology, Trusted Computing, to a NFV cloud-based architecture and proposes a concrete solution (based on the Intel OpenCIT framework) to address each issues. Moreover, a mapping between the ETSI NFV security and trust guidance and the OpenCIT capabilities is proposed. Finally, applicability of the solution to the NFV Management and Network Orchestration stack is discussed, with particular attention to the reference implementation promoted by the ETSI-hosted initiative Open Source MANO
Models for Flow Rate Simulation in Gear Pumps: A Review
No full textGear pumps represent the majority of the fixed displacement machines used for flow generation in fluid power systems. In this context, the paper presents a review of the different methodologies used in the last years for the simulation of the flow rates generated by gerotor, external gear and crescent pumps. As far as the lumped parameter models are concerned, different ways of selecting the control volumes into which the pump is split are analyzed and the main governing equations are presented. The principles and the applications of distributed models from 1D to 3D are reported. A specific section is dedicated to the methods for the evaluation of the necessary geometric quantities: analytic, numerical and Computer-Aided Design (CAD)-based. The more recent studies taking into account the influence on leakages of the interactions between the fluid and the mechanical parts are explained. Finally the models for the simulation of the fluid aeration are described. The review brings to evidence the increasing effort for improving the simulation models used for the design and the optimization of the gear machines
A feasibility study on the potential expansion of the district heating network of Turin
No full textReduction in energy consumptions and CO2 emissions and increase in the use of renewable energy sources can be reached through large scale implementation of energy efficiency measures. In urban contexts, district heating (DH) systems are expected to allow integration of waste heat and thermal renewable sources. In this work we propose a GIS-based model for the technical feasibility analysis of possible expansions of existing DH networks. The application to the City of Turin is presented as a case study
Currents Passing Through the Human Body: The Numerical Viewpoint
No full textIn the case of direct or indirect contact with electrically energized parts, an electric current circulates through the body. When the magnitude and duration of the current through the heart exceed the ventricular fibrillation thresholds, the cardiac muscle starts uncoordinated contractions, greatly jeopardizing the life of the subject. Technical standards on electrical installations describe the protective measures against direct and indirect contact necessary to minimize the probability of inception of ventricular fibrillation. Safety considerations are based on experiments made in the past on animals, but the extrapolation of results to human beings is complex and rather questionable. The purpose of this study is to analyze the body factors that affect the distribution of currents passing through the human body with virtual anatomical models. A set of 16 models of individuals is used to simulate different electric contacts. The use of virtual models of a diverse population (i.e., eight males and eight females, ten adults and six children) provides a statistical support to the results. The obtained heart-current factors, are compared with values present in the literature. This paper provides a novel viewpoint on the problem, and supports the ongoing research activity and efforts to improve the electrical safety of persons
An MPPT technique for unshaded/shaded photovoltaic array based on transient evolution of series capacitor
No full textFor maximum power point (MPP) application, the transient evolution of capacitor can be exploited to examine the power-voltage (P-V) characteristics of a photovoltaic (PV) array. This method is simple and inexpensive. In addition, it can be implemented on any array size whether un-shaded or partially shaded. This paper presents a new MPPT technique that scans the P-V curve of PV array with a series capacitor (Cscan) through a unique H-bridge architecture. The proposed technique employs a simple algorithm, which controls the H-bridge to scan the P-V curve in two sequences: (1) during charging of capacitor, and (2) during discharging of capacitor. The proposed MPPT neither requires the isolation of PV array from load nor executes power loss during checking of P-V curve. The effects of input capacitor (Cin) of converter during scanning of P-V curve are comprehensively discussed, and then the correct sizing of Cscan according to array size is explained with a design example. A comparative analysis of different MPPTs in the context of tracking ability, dynamic, and steady state efficiencies is presented. This analysis highlights the advantage of proposed technique over other MPPTs. Finally, the fundamental operation of proposed MPPT is verified through experimental results
District data management, modelling and visualization via interoperability
No full textData management has been one of the most interesting research fields within the smart city framework over the last years, with the aim of optimizing energy saving at district level. This topic involves the creation of a 3D city model considering heterogeneous datasets, such as Building Information Models (BIMs), Geographical Information Systems (GISs) and System Information Models (SIMs), taking into account both buildings and the energy network. Through the creation of a common platform, the data sharing was allowed starting from the needs of the users, such as the public administrator, the building manager and the energy professional. For this reason, the development of a District Information Modelling (DIM) methodology for the data management, related to the energy saving and CO2 emission, is considered the focus of this paper. It also presents a specific tool developed for the comparison of energy data in a selected district: the Benchmarking Tool
Experimental evaluation of the influence of shock-absorbers on white-body chassis modal behaviour
No full textDifferent matrixes of Sicilian landscapes in Le Cento Città d'Italia. Social identity, cultural landscape and collective consciousness in-between texts and images
No full textENG - This paper attempts to critically analyse some aspects of the disclosure of the Sicilian landscape at a national level. It uses terms set by the Sonzogno publishing house at the turn of the nineteenth and twentieth centuries in its illustrated lecture series, Le Cento Città d'Italia. The results show many different uses of images in support of textual descriptions. The images helped the readers to foreshow various landscapes, leading them to dialectical comparisons that were not always immediate. ITA - Il contributo si propone di analizzare criticamente alcuni aspetti della divulgazione a livello nazionale del paesaggio siciliano, operata dalla casa editrice Sonzogno a cavallo dei secoli XIX e XX, con le relative dispense illustrate della collana Le Cento Città d'Italia. I risultati evidenziano differenti utilizzi dell'immagine a supporto delle descrizioni testuali, nella prefigurazione al lettore dei diversi ambiti dei paesaggi, facendo scaturire confronti dialettici non sempre immediati
