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RISS 인기검색어
- 검색키워드
- 저자 : De Nardi, Sandro (검색결과 5 건)
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Medium Access Control Design for UWB Communication Systems: Review and Trends
Nardis, Luca De,Di Benedetto, Maria-Gabriella The Korea Institute of Information and Commucation 2003 Journal of communications and networks Vol.5 No.4
Future wireless networks are expected to achieve high bit rates at low cost, enabling multimedia and QoS-based services over the wireless medium. The impulse radio ultra-wide band (IR-UWB) technique is a promising candidate in the deployment of such networks, thanks to its potential robustness and capacity. In the past, most of the UWB research focused on hardware and physical layer aspects in order to solve the technological challenges posed by IR-UWB. UWB peculiar characteristics may, however, also stimulate innovative higher layers’ design. This work addresses MAC issues for UWB communication systems. Key areas such as medium sharing, MAC organization, packet scheduling and power control are reviewed. The impact of UWB on the above functions is discussed, and areas which require UWB specific design are identified. Finally, novel MAC functions enabled by UWB specific features, i.e., precise ranging and positioning, are presented.
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Genome Organization in Coffee as Revealed by EST PCR-RFLP, SNPs and SSR Analysis
Mishra, Manoj Kumar,Tornincasa, Patrizia,Nardi, Barbara De,Asquini, Elisa,Dreos, Rene,Terra, Lorenzo Del,Rathinavelu, Rajkumar,Rovelli, Paola,Pallavicini, Alberto,Graziosi, Giorgio 한국작물학회 2011 Journal of crop science and biotechnology Vol.14 No.1
An EST-based PCR-RFLP method was employed to gain insight into genome organization in eight allopolyploid Coffea arabica cultivars and seven diploid coffee species. The PCR-amplified products at 19 EST loci were digested with 46 different restriction enzymes and size fractioned in agarose gels. Most often, the sum of the fragments length was double or more than the PCR product. In arabica, this condition could be explained by assuming the presence of duplicated loci in paralogous chromosomes and this was supported by considerable evidence of multiple loci SSR amplification. Based on the RFLP analysis, 12 EST loci were polymorphic. The level of polymorphism was higher in different species compared to the arabica varieties. Sequencing of the amplified products revealed a SNP frequency of 0.021 among diploid species and of 0.007 among arabica varieties. We propose that the involvement of two genomes in C. arabica maintains a residual level of heterozygosity in the form of paralogous chromosomes, while the self-fertilization in this species tends to drive of homozygosity. The heterozygosity of paralogous chromosomes in arabica creates valuable polymorphism essential for species diversity and survival in various ecological niches, while self-fertility tends to preserve in homozygosity many genes of functional significance.
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Genome Organization in Coffee as Revealed by EST PCRRFLP, SNPs and SSR Analysis
Manoj Kumar Mishra,Patrizia Tornincasa,Barbara De Nardi,Elisa Asquini,René Dreos,Lorenzo Del Terra,Rajkumar Rathinavelu,Paola Rovelli,Alberto Pallavicini,Giorgio Graziosi 한국작물학회 2011 Journal of crop science and biotechnology Vol.14 No.1
An EST-based PCR-RFLP method was employed to gain insight into genome organization in eight allopolyploid Coffea arabica cultivars and seven diploid coffee species. The PCR-amplified products at 19 EST loci were digested with 46 different restriction enzymes and size fractioned in agarose gels. Most often, the sum of the fragments length was double or more than the PCR product. In arabica, this condition could be explained by assuming the presence of duplicated loci in paralogous chromosomes and this was supported by considerable evidence of multiple loci SSR amplification. Based on the RFLP analysis, 12 EST loci were polymorphic. The level of polymorphism was higher in different species compared to the arabica varieties. Sequencing of the amplified products revealed a SNP frequency of 0.021 among diploid species and of 0.007 among arabica varieties. We propose that the involvement of two genomes in C. arabica maintains a residual level of heterozygosity in the form of paralogous chromosomes, while the self-fertilization in this species tends to drive of homozygosity. The heterozygosity of paralogous chromosomes in arabica creates valuable polymorphism essential for species diversity and survival in various ecological niches, while self-fertility tends to preserve in homozygosity many genes of functional significance.
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Garagiola, Umberto,Grigolato, Roberto,Soldo, Rossano,Bacchini, Marco,Bassi, Gianluca,Roncucci, Rachele,De Nardi, Sandro Korean Association of Maxillofacial Plastic and Re 2016 Maxillofacial Plastic Reconstructive Surgery Vol.38 No.-
Background: We reviewed the biological and mechanical properties of porous hydroxyapatite (HA) compared to other synthetic materials. Computer-aided design/computer-aided manufacturing (CAD/CAM) was also evaluated to estimate its efficacy with clinical and radiological assessments. Method: A systematic search of the electronic literature database of the National Library of Medicine (PubMed-MEDLINE) was performed for articles published in English between January 1985 and September 2013. The inclusion criteria were (1) histological evaluation of the biocompatibility and osteoconductivity of porous HA in vivo and in vitro, (2) evaluation of the mechanical properties of HA in relation to its porosity, (3) comparison of the biological and mechanical properties between several biomaterials, and (4) clinical and radiological evaluation of the precision of CAD/CAM techniques. Results: HA had excellent osteoconductivity and biocompatibility in vitro and in vivo compared to other biomaterials. HA grafts are suitable for milling and finishing, depending on the design. In computed tomography, porous HA is a more resorbable and more osteoconductive material than dense HA; however, its strength decreases exponentially with an increase in porosity. Conclusions: Mechanical tests showed that HA scaffolds with pore diameters ranging from 400 to $1200{\mu}m$ had compressive moduli and strength within the range of the human craniofacial trabecular bone. In conclusion, using CAD/CAM techniques for preparing HA scaffolds may increase graft stability and reduce surgical operating time.
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Umberto Garagiola,Roberto Grigolato,Rossano Soldo,Marco Bacchini,Gianluca Bassi,Rachele Roncucci,Sandro De Nardi 대한악안면성형재건외과학회 2015 Maxillofacial Plastic Reconstructive Surgery Vol.37 No.-
Background: We reviewed the biological and mechanical properties of porous hydroxyapatite (HA) compared toother synthetic materials. Computer-aided design/computer-aided manufacturing (CAD/CAM) was also evaluated toestimate its efficacy with clinical and radiological assessments. Method: A systematic search of the electronic literature database of the National Library of Medicine (PubMed-MEDLINE) was performed for articles published in English between January 1985 and September 2013. The inclusioncriteria were (1) histological evaluation of the biocompatibility and osteoconductivity of porous HA in vivo and in vitro,(2) evaluation of the mechanical properties of HA in relation to its porosity, (3) comparison of the biological andmechanical properties between several biomaterials, and (4) clinical and radiological evaluation of the precision ofCAD/CAM techniques. Results: HA had excellent osteoconductivity and biocompatibility in vitro and in vivo compared to other biomaterials. HA grafts are suitable for milling and finishing, depending on the design. In computed tomography, porous HA is amore resorbable and more osteoconductive material than dense HA; however, its strength decreases exponentiallywith an increase in porosity. Conclusions: Mechanical tests showed that HA scaffolds with pore diameters ranging from 400 to 1200 μm hadcompressive moduli and strength within the range of the human craniofacial trabecular bone. In conclusion, usingCAD/CAM techniques for preparing HA scaffolds may increase graft stability and reduce surgical operating time.
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