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RISS 인기검색어
- 검색키워드
- 저자 : Olivari, Mario (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Methods for Multiloop Identification of Visual and Neuromuscular Pilot Responses
Olivari, Mario,Nieuwenhuizen, Frank M.,Venrooij, Joost,Bulthoff, Heinrich H.,Pollini, Lorenzo IEEE 2015 IEEE transactions on cybernetics Vol.45 No.12
<P>In this paper, identification methods are proposed to estimate the neuromuscular and visual responses of a multiloop pilot model. A conventional and widely used technique for simultaneous identification of the neuromuscular and visual systems makes use of cross-spectral density estimates. This paper shows that this technique requires a specific noninterference hypothesis, often implicitly assumed, that may be difficult to meet during actual experimental designs. A mathematical justification of the necessity of the noninterference hypothesis is given. Furthermore, two methods are proposed that do not have the same limitations. The first method is based on autoregressive models with exogenous inputs, whereas the second one combines cross-spectral estimators with interpolation in the frequency domain. The two identification methods are validated by offline simulations and contrasted to the classic method. The results reveal that the classic method fails when the noninterference hypothesis is not fulfilled; on the contrary, the two proposed techniques give reliable estimates. Finally, the three identification methods are applied to experimental data from a closed-loop control task with pilots. The two proposed techniques give comparable estimates, different from those obtained by the classic method. The differences match those found with the simulations. Thus, the two identification methods provide a good alternative to the classic method and make it possible to simultaneously estimate human's neuromuscular and visual responses in cases where the classic method fails.</P>
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Wind-tunnel blockage effect on drag coefficient of circular cylinders
Anthoine, J.,Olivari, D.,Portugaels, D. Techno-Press 2009 Wind and Structures, An International Journal (WAS Vol.12 No.6
This paper explains how to correctly measure the drag coefficient of a circular cylinder in wind tunnels with large blockage ratios and for the sub-critical to the super-critical flow regimes. When dealing with large blockage ratios, the drag has to be corrected for wall constraints. Different formulations for correcting blockage effect are compared for each flow regime based on drag measurements of smooth circular cylinders performed in a wind tunnel for three different blockage ratios. None of the correction model known in the literature is valid for all the flow regimes. To optimize the correction and reduce the scatter of the results, different correction models should be combined depending on the flow regime. In the sub-critical regime, the best results are obtained using Allen and Vincenti's formula or Maskell's theory with ${\varepsilon}$=0.96. In the super-critical regime, one should prefer using Glauert's formula with G=0.6 or the model of Modi and El-Sherbiny. The change in the formulations appears at the flow transition with a variation of the wake pattern when passing from sub-critical to super-critical flow regimes. This parameter being not considered in the known blockage corrections, these theories are not valid for all the flow regimes.
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Wind-tunnel blockage effect on drag coefficient of circular cylinders
J. Anthoine,D. Olivari,D. Portugaels 한국풍공학회 2009 Wind and Structures, An International Journal (WAS Vol.12 No.6
This paper explains how to correctly measure the drag coefficient of a circular cylinder in wind tunnels with large blockage ratios and for the sub-critical to the super-critical flow regimes. When dealing with large blockage ratios, the drag has to be corrected for wall constraints. Different formulations for correcting blockage effect are compared for each flow regime based on drag measurements of smooth circular cylinders performed in a wind tunnel for three different blockage ratios. None of the correction model known in the literature is valid for all the flow regimes. To optimize the correction and reduce the scatter of the results, different correction models should be combined depending on the flow regime. In the sub-critical regime, the best results are obtained using Allen and Vincenti’s formula or Maskell’s theory with ε=0.96. In the super-critical regime, one should prefer using Glauert’s formula with G=0.6 or the model of Modi and El-Sherbiny. The change in the formulations appears at the flow transition with a variation of the wake pattern when passing from sub-critical to super-critical flow regimes. This parameter being not considered in the known blockage corrections, these theories are not valid for all the flow regimes.
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Sebastian Manuel Milluzzo,Paola Cesaro,Leonardo Minelli Grazioli,Nicola Olivari,Cristiano Spada 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.3
The present manuscript aims to review the history, recent advances, evidence, and challenges of artificial intelligence (AI) incolonoscopy. Although it is mainly focused on polyp detection and characterization, it also considers other potential applications (i.e.,inflammatory bowel disease) and future perspectives. Some of the most recent algorithms show promising results that are similar tohuman expert performance. The integration of AI in routine clinical practice will be challenging, with significant issues to overcome(i.e., regulatory, reimbursement). Medico-legal issues will also need to be addressed. With the exception of an AI system that isalready available in selected countries (GI Genius; Medtronic, Minneapolis, MN, USA), the majority of the technology is still in itsinfancy and has not yet been proven to reach a sufficient diagnostic performance to be adopted in the clinical practice. However,larger players will enter the arena of AI in the next few months.
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