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This paper is focused on the results of the research project simBART. Particular attention is paid on a method for water evaluation in beer production sector. This process, under investigation, can be targeted to small and not industrialised enterprises as well as to those home brewing productions. Experimental analyses are conducted by means of VPeN, a vapour phase e-nose based on a specific sensor...
Advances in remote sensing technology are now providing tools to support geospatial mapping of the soil properties for the application to the management of agriculture and the environment. In this paper results of visible and near IR spectral reflectance are presented and discussed. A supportable evaluation of organic matter in the soil is the absence of a specific signature, this concept arose out...
In this work, for the first time, the dependence of the GaN HEMTs current collapse from the profile of the Fe-doped semi-insulating GaN buffers has been demonstrated both experimentally and by means of numerical simulations based on the SIMS measured profile of the GaN buffer Fe-doping concentration.
Aim of this paper is to propose a solution to the correspondence problem in multi-camera systems. In these systems, two or more cameras are used to record the same scene from different view points. In this way it is possible to face the problem of occlusions in crowding scenes. In this work an object level motion detection algorithm is used and it is applied to the videos sampled by two cameras. The...
In this paper, we investigate the effects of dc stress on GaN high-electron mobility transistors (HEMTs) by means of numerical simulations. Following stress tests showing a degradation of static characteristics (dc), the formation of an electron trap in the AlGaN barrier layer was related to the observed degradation according to the results obtained from numerical simulations carried out by introducing...
The goal of this study is to propose a virtual classroom tool integrated within an e-learning 2.0 architecture supported by a multi agent system with auction-based approach. The proposed architecture and related features aim to provide the teacher / tutor with functionalities for monitoring, planning courses or redesigning them if necessary. The main purpose was to design a Multi Agent System (MAS)...
The aim of this paper is to address the issue concerning the tools for getting feedback from e-learning platform users. Our research analyzes the role of human presence in mediated learning environments proposing a possible strategy to detect it. The proposed system is based on web 2.0 patterns that are suitable for activating a virtual classroom tool with a feedback system to evaluate the student's...
We investigate the role of the 0.5 eV traps in determining GaN HEMT degradation by means of DC and rf testing, and 2D numerical simulation. We demonstrate that generation of deep levels, having an activation energy of 0.5 eV, is responsible for the degradation observed during rf aging; we show that the occurrence of trap-induced degradation depends on rf driving conditions. We also show that degradation...
In this paper a complete comparison between Copper (Cu) gate and Nickel-Gold (Ni/Au) gate passivated AlGaN/GaN High Electron Mobility Transistors (HEMTs) is presented. DC and Radio Frequency (RF) performance was compared in order to evaluate the behaviour of the two Schottky contacts in the standard HEMT structure. From the obtained data a critical drain current collapse was observed in the Cu-gate...
Aim of this paper is to present an intelligent distributed monitoring system designed to monitor the air quality in specific indoor environments. The proposed architecture is very flexible and the used design principles can be applied to various indoor and outdoor environments. In this work the authors describe the features of this system tuned for monitoring the air quality in a healthcare center...
An Ontology-based approach to environmental signature detection with particular reference to navigating vessels is presented. The final attempt will be to check if environmental markers taken from MODIS sensors (hence at moderate spatial resolutions, from 250m up to 1 km) can be reversely associated with the event of a vessel transit or presence. To fulfill this requirement, although at an early stage,...
Aim of this work is to present a metaphor based multilevel interface for an Intelligent Transport System (ITS) designed to handle the transport of hazardous materials. This ITS was developed by the authors in the framework of a research project funded by Apulia Region (Italy). Starting from monitoring some parameters of a vehicle in motion such as position, speed, load balancing, stress conditions,...
This paper aims at showing how to classify driving patterns in terms of primitives such as acceleration, deceleration and turning, using neural networks. In particular a multilayer perceptron with back-propagation learning algorithm is used. The considered feature space is reduced to a very restricted couple of sensors: accelerometer and GPS receiver, which characterize many commercial low-cost inertial...
The aim of this paper is to describe the methodology employed in the construction of a virtual classroom tool based on a collaborative learning interface, also able to analyze and measure users data for assessing the application performance and evaluating the level of students participation in the proposed e-learning model. The future target will be based on the comparison of the results obtained...
Detecting human presence automatically is a challenging task since several environmental parameters may affect the quality and the continuity of detection. Although many techniques have been developed so far in the literature to solve this problem, they generally rely on well-defined operational context. Hence, they are sensitive to uncontrolled variables and unpredicted events. In this work an ontology-based...
Aim of this work is to present a new approach to the problem of user presence monitoring in working environments. Particularly, this work is focused on the evaluation of the presence or absence of a user in front of a terminal. This question is of paramount importance in applications requiring the user's presence e.g. video surveillance systems, control centrals, etc. The authors propose a technique...
A hierarchical multi-agent system that exploits one (or more) semantic lexicon for performing semantic markup of Web resources is presented. Semantic lexicon is considered here as a golden ontology defining taxonomical relations among concepts such as hypernymy, meronymy, holonymy and so forth. The system attempts to annotate Web resources according to the available taxonomical relations using simple...
The reliability of GaN HEMTs under RF stress has been evaluated and correlated with DC stress and current DLTS measurements techniques. During RF operation a degradation of output power, PAE and an increase in reverse gate current has been observed. A similar degradation has been observed by applying reverse biases to the gate terminal under DC operation, resulting in an increase in drain current-collapse...
This paper addresses the new emerging approach of Semantic Lexicon-based systems for modeling semantic Web applications. The paper endeavors to shed lights on some misconceptions in the literature about the use of taxonomy and ontology as interchangeable terms, defining a midpoint between the two extremes. Semantic Lexicon is considered as the right match between the semantic layer represented by...
This paper discusses a Web 2.0 oriented training model currently under consideration in the framework of the guidance project called ldquoAriann@rdquo activated by the Polytechnic of Bari. The focus is that of presenting a strongly customized e-learning platform characterized by two main priorities: accomplishing the guidance task by providing support, information, and advice in all those aspects...
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