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- 검색키워드
- 저자 : Grigolato, Roberto (검색결과 3 건)
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Stefano Grigolato,Stefano Panizza,Marco Pellegrini,Pierre Ackerman,Raffaele Cavalli 한국산림과학회 2016 Forest Science And Technology Vol.12 No.2
Terrain access is a critical factor influencing the feasibility of forest operations in steep mountainous terrain. Long extraction distances coupled with terrain obstacles can favor the use of helicopters in timber extraction in such areas. However, helicopter logging in the Italian Alps is not commonplace when compared to other Alpine regions, for example, in Switzerland and Austria. The use of light-lift helicopters has recently caught the attention of practitioners as an alternative to more traditional medium- to heavy-lift aircraft in the Alps. This article reports the findings of two preliminary case studies using light-lift helicopters for the extraction of high value timber and fire-damaged timber subsequently exposed to bark beetle disturbance. In order to provide a comprehensive analysis of the factors affecting helicopter logging productivity, the two case studies were separately analyzed using time-element analysis supported by on-board global navigation satellite system (GNSS) devices. Additionally, an external video camera was used to continuously monitor the operations. The payload utilization was 86% for the extraction of high value timber and 70% for fire-damaged timber subsequently exposed to bark beetle disturbance. Variation in the turn time was mostly related to the hooking, choker return, and load times, as well as flying distance. Above all, the load hooking time explains c. 27% of the variance, revealing its critical influence on logging productivity.
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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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