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RISS 인기검색어
- 검색키워드
- 저자 : Diego Hernandez-Hernandez (검색결과 3 건)
- 무료
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Diego Hernandez-Hernandez,Tam Larkin,Nawawi Chouw 국제구조공학회 2024 Structural Engineering and Mechanics, An Int'l Jou Vol.89 No.4
This research addresses experimentally the relationship between the excitation frequency and both hoop and axial wall stresses in a water storage tank. A low-density polyethylene tank with six different aspect ratios (water level to tank radius) was tested using a shake table. A laminar box with sand represents a soil site to simulate Soil-Structure Interaction (SSI). Sine excitations with eight frequencies that cover the first free vibration frequency of the tank-water system were applied. Additionally, Ricker wavelet excitations of two different dominant frequencies were considered. The maximum stresses are compared with those using a nonlinear elastic spring-mass model. The results reveal that the coincidence between the excitation frequency and the free-vibration frequency of the soil-tank-water system increases the sloshing intensity and the rigid-like body motion of the system, amplifying the stress development considerably. The relationship between the excitation frequency and wall stresses is nonlinear and depends simultaneously on both sloshing and uplift. In most cases, the maximum stresses using the nonlinear elastic spring-mass model agree with those from the experiments.
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DeepToF : off-the-shelf real-time correction of multipath interference in time-of-flight imaging
Marco, Julio,Hernandez, Quercus,Muñ,oz, Adolfo,Dong, Yue,Jarabo, Adrian,Kim, Min H.,Tong, Xin,Gutierrez, Diego Association for Computing Machinery 2017 ACM transactions on graphics Vol. No.
<P>Time-of-flight (ToF) imaging has become a widespread technique for depth estimation, allowing affordable off-the-shelf cameras to provide depth maps in real time. However, multipath interference (MPI) resulting from indirect illumination significantly degrades the captured depth. Most previous works have tried to solve this problem by means of complex hardware modifications or costly computations. In this work, we avoid these approaches and propose a new technique to correct errors in depth caused by MPI, which requires no camera modifications and takes just 10 milliseconds per frame. Our observations about the nature of MPI suggest that most of its information is available in image space; this allows us to formulate the depth imaging process as a spatially-varying convolution and use a convolutional neural network to correct MPI errors. Since the input and output data present similar structure, we base our network on an autoencoder, which we train in two stages. First, we use the encoder (convolution filters) to learn a suitable basis to represent MPI-corrupted depth images; then, we train the decoder (deconvolution filters) to correct depth from synthetic scenes, generated by using a physically-based, time-resolved renderer. This approach allows us to tackle a key problem in ToF, the lack of ground-truth data, by using a large-scale captured training set with MPI-corrupted depth to train the encoder, and a smaller synthetic training set with ground truth depth to train the decoder stage of the network. We demonstrate and validate our method on both synthetic and real complex scenarios, using an off-the-shelf ToF camera, and with only the captured, incorrect depth as input.</P>
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Poster Session : PS 0633 ; Respiratory Medicine ; COPD and Percutaneous Coronary Intervention
( Pavel Alexei Chisholm Sanchez ),( Javier De Miguel Diez ),( Diego Jose Castrillon Rodriguez ),( Rodrigo Jimenez Garcia ),( Valentin Hernandez Barrera ),( Pilar Carrasco Garrido ),( Ana Lopez De Andr 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: To compare trends in the use and outcomes of PCI in patients COPD and non COPD patients in Spain from 2001 to 2011. Methods: We identifi ed all patients who had undergone PCI, using national hospital discharge data. Discharges were divided, according to history of COPD, in 2 groups: COPD and non COPD. The incidence of discharges attributed to percutaneous coronary intervention were calculated and stratifi ed by COPD status. We calculated comorbidity Charlson Comorbidity Index (CCI), length of stay (LOS) and in-hospital mortality (IHM). Results: From 2001 to 2011, 434,108 PCI´s were performed. The incidence of use of PCI increased over time in both groups (p<0.05), COPD and non COPD, from 4.94 per 100,000 inhabitants in 2001 to 11.76 in 2011 in COPD, and from 87.74 to 177.56 in non COPD. Comorbidity increased signifi cantly in both groups (p<0.05). The average LOS decreased signifi cantly over time, from 9 (IQR 10) days in 2001 to 6 (IQR 6) days in COPD patients, and from 6 (IQR 9) days in 2001 to 5 (IQR 6) days in patients without COPD. IHM changed signifi cantly over the entire study period among patients with COPD (from 2.65% in 2001 to 2.66% in 2011, p<0,05, x2 linear trend analysis) and non COPD (from 1.92% in 2001 to 1.85% in 2011, p<0,05, x2 linear trend analysis). Conclusions: The incidence of use of PCI procedures increased over time in COPD and non COPD patients. Increasing comorbidity can be associated with a higher use of PCI procedures. LOS and IHM were higher in patients with COPD than in those without this disease.
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