Search results for "codes"

showing 10 items of 201 documents

SVG Rendering by Watershed Decomposition

2005

Scalable Vector Graphics Watershed Decomposition Raster to Vector Chain Codes representation
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Nuovi scenari del design: meno spreco e più sobrietà

2009

Il testo considera i modelli tradizionali di crescita economica che rispondono ad un’economia di tipo lineare, nella quale si estraggono, si producono, si consumano e si eliminano le risorse. In un mondo che ha risorse limitate e che cresce globalmente dobbiamo pensare al futuro con modelli di produzione e consumo più sostenibili.

Settore ICAR/13 - Disegno Industrialeecodesign eco-efficienza design sistemico
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workshop/Bag Pack_Nuovi stili di vita e di consumo/Packaging in carta e cartone

2009

Settore ICAR/13 - Disegno Industrialeecodesignconsumi responsabili sostenibilità packaging biodegradabili
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Codes of research ethics: what are they useful for; and what are their limitations?

2012

This paper considers the usefulness, and limitations, of codes of research ethics for the planning researcher. Formal ethical approval of planning research, and explicit agreement to adhere to specified codes of ethics, is required for research by planning academics in more and more countries. What might those promoting these processes be hoping to achieve, and how do they think the codes will help? There has been discussion of codes of professional ethics in planning for some decades (Hendler,1990; Taylor,1992), and the paper considers whether these contain arguments which could also justify codes of research ethics. The fact that planning research is undertaken both outside and inside uni…

Settore ICAR/21 - Urbanisticacodes of ethicplanning researchresearch ethic
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Introduzione - Criteri innovativi per la progettazione e produzione ecocompatibile (Eco-design) di prodotti che consumano energia (EuP) nel settore c…

2013

Settore ING-IND/11 - Fisica Tecnica AmbientaleEcodesign Prodotti che consumano energia EuP
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Criteri innovativi per la progettazione e produzione eco-compatibile (eco-design) di prodotti che consumano energia (EuP) nel settore civile d'utenza

2013

Settore ING-IND/11 - Fisica Tecnica AmbientaleEcodesign Prodotti che consumano energia EuP
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Rateless Codes Performance Analysis in Correlated Channel Model for GEO Free Space Optics Downlinks

2012

Settore ING-INF/03 - TelecomunicazioniFree Space Optics (FSO) technologies for satellite communications offer several advantages: wide bandwidth high rate capability immunity to electromagnetic interference and small equipment size. Thus they are suitable for inter-satellite links deep space communications and also for high data rate ground-to-satellite/satellite-to-ground communications. Nevertheless FSO links suffer impairments that cause power signal degradation at the receiver. Scattering and absorption cause power signal attenuations predictable by suitable deterministic models. Optical turbulence causes random irradiance fluctuations which can generate signal fading events and can thereby only be predicted by statistical models. Attenuation and fading events can corrupt FSO links and so it would be recommended to add mitigation error codes on the communication link. FSO channel can be described as an erasure channel: fading events can cause erasure errors. We have identified in rateless codes (RCs) a suitable solution to be employed in FSO links. RCs do not need feedback and they add a redundant coding on the source data that allows the receiver to recover the whole payload despite erasure errors. We implemented two different of rateless codes: Luby Transform (LT) and Raptor. We analyzed their performances on a simulated turbulent GEO FSO downlink (1 Gbps - OOK modulation) at a 106 μm wavelength and for different values of zenith angles. Assuming a plane-wave propagation and employing Hufnagel-Valley we modeled the downlink using: 1) a temporal correlated channel model based on Gamma-Gamma probability distribution and 2) an irradiance covariance function that we converted on a time function using Taylor frozen eddies hypothesis. Our new channel model is able to simulate irradiance fluctuations at different turbulence conditions as it will be shown in the full paper. We will also report performance results of LT and Raptor codes at overhead range varying between 0 and 50% and for different values of source packets.Settore ING-INF/01 - Elettronica
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Correlated channel model for terrestrial Free Space Optics: performance analysis of rateless codes

2012

We describe a novel correlated channel model able to predict random temporal fluctuations of optical signal irradiance caused by scintillation. With regards to the same channel, we also report simulation results on the error mitigation performance of Luby-Transform and Raptor codes.

Settore ING-INF/03 - TelecomunicazioniFree Space Optics channel modeling Raptor codes RaptorQ codes LT codes rateless codesSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Luby Transform Performance Tests on Time-Correlated Channel Model for Geo Free Space Optics Downlinks

2012

Settore ING-INF/03 - TelecomunicazioniSettore ING-INF/01 - ElettronicaFree Space Optics Luby Transform Codes Rateless Codes Channel Modeling Geo Free Space Optics Downlinks
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Performance Investigation of Fountaine Codes on a Simulated Terrestrial Free Space Optical Channel

2012

Settore ING-INF/03 - TelecomunicazioniSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - ElettronicaFree Space Optics Channel Modeling Fountain Codes Raptor Codes RaptorQ Codes Luby Transform Codes Rateless Codes
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