1,720,966 research outputs found
Operating Results of a 20MW Biomass Generating Plant in Italy and a GIS Analysis for Exploiting Wood Availability
No full textAn electric 20 MW generating plant has been installed in northern Italy (Lombardy region) since 2010. Due to connection rules the plant is connected to the national transmission system at 132 kV. The biomass chosen as a fuel of the generating plant is mainly poplar chip which is produced in different areas at a distance less than 70 km in order to limit their environmental impact because of transportation and related emissions and to benefits of the Italian incentives schemes related to the so called “short supply chain”.
The paper will illustrate the basic idea and the most significant elements of the plant; its operative results obtained in the last 4 years are also discussed together to the plant emissions.
A particular attention is spent to analyze the biomass composition and cost which make the plant operating life sustainable by the environment and economic point of view. According to the design stage, the electric energy produced by the plant is kept as near as possible to its rated value so that a suitable policy of biomass acquisition, storage and maintenance must be applied. A suitable GIS tool has also been used to compare the biomass use of the plant and a possible management of Lombardy region in order to better maintain the wooded area within a
Network Virtual Machine (NetVM): Portabilità ed efficienza nell'elaborazione di pacchetti di rete
Full text linkUn progettista di dispositivi di rete deve affrontare, oltre alle problematiche di prestazioni legate all’aumento della velocità di rete, anche la necessità di aumentare la programmabilità di tali dispositivi al fine di semplificare l’implementazione di applicazioni come, ad esempio, firewall e sistemi per l’individuazione di intrusioni (intrusion detection system, IDS). Questo articolo presenta la nostra attività di progettazione e realizzazione di un network processor virtuale, chiamato NetVM, che dispone di un insieme di istruzioni ottimizzate per l’elaborazione dei pacchetti. La NetVM si prefigge di fornire uno strato di compatibilità per l’elaborazione di pacchetti (come ad esempio il filtraggio, il conteggio, lo string matching) eseguiti da varie applicazioni (firewall, network monitor, IDS) così che possano essere eseguiti da un qualunque apparato di rete, dal costoso router al piccolo dispositivo (come ad esempio uno smart phone). Inoltre, la NetVM permetterà di ottenere in modo efficiente corrispondenza tra le sopracitate funzinoalità di elaborazione di pacchetti e unità hardware specifiche (come ad esempio, ASIC, FPGA, ed elementi per l’elaborazione di rete) presenti in specifici sistemi hardware, come apparati di rete o loro componenti
Comparative Evaluation of Packet Classification Algorithms for Implementation on Resource Constrained Systems
Full text linkThis paper provides a comparative evaluation of a number of known classification algorithms that have been considered for both software and hardware implementation. Differently from other sources, the comparison has been carried out on implementations based on the same principles and design choices. Performance measurements are obtained by feeding the implemented classifiers with various traffic traces in the same test scenario. The comparison also takes into account implementation feasibility of the considered algorithms in resource constrained systems (e.g. embedded processors on special purpose network platforms). In particular, the comparison focuses on achieving a good compromise between performance, memory usage, flexibility and code portability to different target platforms
Network Virtual Machine (NetVM): A New Architecture for Efficient and Portable Packet Processing Applications
Full text linkA challenge facing network device designers, besides increasing the speed of network gear, is improving its programmability in order to simplify the implementation of new applications (see for example, active networks, content networking, etc). This paper presents our work on designing and implementing a virtual network processor, called NetVM, which has an instruction set optimized for packet processing applications, i.e., for handling network traffic. Similarly to a Java Virtual Machine that virtualizes a CPU, a NetVM virtualizes a network processor. The NetVM is expected to provide a compatibility layer for networking tasks (e.g., packet filtering, packet counting, string matching) performed by various packet processing applications (firewalls, network monitors, intrusion detectors) so that they can be executed on any network device, ranging from expensive routers to small appliances (e.g. smart phones). Moreover, the NetVM will provide efficient mapping of the elementary functionalities used to realize the above mentioned networking tasks upon specific hardware functional units (e.g., ASICs, FPGAs, and network processing elements) included in special purpose hardware systems possibly deployed to implement network devices
Monitoring and assessment for the sustainable management of historical buildings
No full textAssessment and monitoring actions are integrated as possible strategies for sustainable preservation and Cultural Heritage management. In particular, the indoor environment’s performance assessment is necessary to verify either if the building meets users’ requirements, or further planned actions (refurbishment, new systems installation, etc.) are needed. The Cultural Heritage has strict preservation requirements, but it is necessary to meet the users’ needs in term of environmental quality, safety and management. The paper illustrates a research developed by the CISRiC and the SITI Institute, on behalf of ENEA (Italian National agency for new technologies, Energy and sustainable economic development). The goal is the definition of innovative tools for energy efficiency assessment and monitoring, with the purpose of defining guidelines aimed at improving energy and efficient management of the building-plant system. The case study is the southern wing of the Villa Reale in Monza (1777-1780), which represents the high complexity of historical buildings
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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