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Hybrid first and second order attention Unet for building segmentation in remote sensing images

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Science China(Information Sciences) 2020年第4期63卷 69-80页

作者： Nanjun HE Leyuan FANG antonio PLAZA College of Electrical and Information Engineering Hunan University Hyperspectral Computing Laboratory Department of Technology of Computers and CommunicationsEscuela Politecnica University of Extremadura

Recently, building segmentation(BS) has drawn significant attention in remote sensing applications. Convolutional neural networks(CNNs) have become the mainstream analysis approach in this field owing to their powerful representative ability. However, owing to the variation in building appearance, designing an effective CNN architecture for BS still remains a challenging task. Most of CNN-based BS methods mainly focus on deep or wide network architectures, neglecting the correlation among intermediate *** address this problem, in this paper we propose a hybrid first and second order attention network(HFSA)that explores both the global mean and the inner-product among different channels to adaptively rescale intermediate features. As a result, the HFSA can not only make full use of first order feature statistics, but also incorporate the second order feature statistics, which leads to more representative feature. We conduct a series of comprehensive experiments on three widely used aerial building segmentation data sets and one satellite building segmentation data set. The experimental results show that our newly developed model achieves better segmentation performance over state-of-the-art models in terms of both quantitative and qualitative results.

关键词： building segmentation(BS) convolutional neural networks(CNNs) remote sensing high order pooling attention

Algorithms to Compute the Largest Invariant Set Contained in an Algebraic Set for Continuous-Time and Discrete-Time Nonlinear Systems

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IEEE/CAA Journal of Automatica Sinica 2020年第1期7卷 57-69页

作者： Laura Menini Corrado Possieri antonio Tornambè Dipartimento di Ingegneria Industriale Universitàdi Roma Tor VergataRoma 00133Italy Istituto di Analisi dei Sistemi ed Informatica“A.Ruberti ”Consiglio Nazionale delle Ricerche(IASI-CNR)Roma 00185Italy Dipartimento di Ingegneria Civile e Ingegneria Informatica Universitàdi Roma Tor VergataRoma 00133Italy

In this paper, some computational tools are proposed to determine the largest invariant set, with respect to either a continuous-time or a discrete-time system, that is contained in an algebraic set. In particular, it is shown that if the vector field governing the dynamics of the system is polynomial and the considered analytic set is a variety, then algorithms from algebraic geometry can be used to solve the considered problem. Examples of applications of the method(spanning from the characterization of the stability to the computation of the zero dynamics) are given all throughout the paper.

关键词： Asymptotic stability discrete-time systems invariance nonlinear systems

Effect of temperature on deep lined circular tunnels in transversely anisotropic elastic rock

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Underground Space 2016年第2期1卷 79-93页

作者： Tao Fei Bobet antonio Lyles School of Civil Engineering Purdue UniversityWest LafayetteINUSA Department of Geotechnical Engineering Tongji UniversityShanghaiChina

Considerably less attention has been given to thermal stresses in a *** changes in the ground or inside the tunnel,*** to fire,can cause cracking and damage to the liner and surrounding *** study derived analytical solutions for stresses and displacements caused by thermal load for a lined circular tunnel under a transversely anisotropic ground where the ground anisotropy axis coincides with the stacking *** FEM code ABAQUS was used to study a lined deep tunnel when the ground anisotropy axis is perpendicular to the stacking direction.A parametric study was performed to investigate the effects of Young’s modulus,Poisson’s ratio,thermal conductivity and the coefficient of thermal expansion on the behavior of the liner and *** results show that the Young’s modulus and the coefficient of thermal expansion are the most important parameters that determine the stresses and displacements of the liner and *** analysis also shows that the thermal conductivity has a significant effect on the temperature distribution in the ground.

关键词： Deep tunnel Circular liner Transversely anisotropic ground Thermal stresses

Infrastructure for collaborative science and societal applications in the Columbia River estuary

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Frontiers of Earth Science 2015年第4期9卷 659-682页

作者： antonio M. BAPTISTA NSF Science and Technology Center for Coastal Margin Observation & Prediction Oregon Health & Science University Portland Oregon 97239 USA Oregon Health & Science University Astoria Oregon 97103 USA Portland State University Portland Oregon 97201 USA Applied Physics Laboratory of the University of Washington Seattle Washington 98105 USA Oregon State University Corvallis Oregon 97331 USA Formerly University of Maryland Center for Environmental Studies Maryland 21613 USA

To meet societal needs, modem estuarine science needs to be interdisciplinary and collaborative, combine discovery with hypotheses testing, and be responsive to issues facing both regional and global stakeholders. Such an approach is best conducted with the benefit of data-rich environments, where information from sensors and models is openly accessible within convenient timeframes. Here, we introduce the operational infrastruc- ture of one such data-rich environment, a collaboratory created to support （a） interdisciplinary research in the Columbia River estuary by the multi-institutional team of investigators of the Science and Technology Center for Coastal Margin Observation ＆ Prediction and （b） the integration of scientific knowledge into regional decision making. Core components of the operational infrastructure are an observation network, a modeling system and a cyber-infrastructure, each of which is described. The observation network is anchored on an extensive array of long-term stations, many of them interdisciplinary, and is complemented by on-demand deployment of temporary stations and mobile platforms, often in coordinated field campaigns. The modeling system is based on finite- element unstructured-grid codes and includes operational and process-oriented simulations of circulation, sediments and ecosystem processes. The flow of information is managed through a dedicated cyber-infrastructure, con- versant with regional and national observing systems.

关键词： estuaries observations numerical modeling,cyber-infrastructure Columbia River

How to deal with right hepatic artery coming from the superior mesenteric artery during minimally invasive pancreaticoduodenectomy: A systematic review

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Hepatobiliary & Pancreatic Diseases International 2023年第2期22卷 121-127页

作者： Andrea Chierici antonio Castaldi Mohamed El Zibawi Edoardo Rosso antonio Iannelli Service de Chirurgie Digestive Centre Hospitalier d’Antibes Juan-les-PinsAntibesFrance Department of Digestive Surgery and Liver Transplantation University Hospital Center of NiceNiceFrance Department of Radiology University Hospital Center of NiceNiceFrance Department of Surgery Centre Hospitalier de LuxembourgLuxembourgLuxembourg Faculty of Medicine UniversitéCôte d’AzurNiceFrance Inserm U1065Team 8’Hepatic Complications of Obesity and Alcohol’NiceFrance

Background: Anatomical variations in the liver arterial supply are quite common and can affect the surgical strategy when performing a minimally invasive pancreaticoduodenectomy(MIPD). Their presence must be preemptively detected to avoid postoperative liver and biliary complications. Data sources: Following the PRISMA guidelines and the Cochrane protocol we conducted a systematic review on the management of an accessory or replaced right hepatic artery(RHA) arising from the superior mesenteric artery when performing an MIPD. Results: Five studies involving 118 patients were included. The most common reported management of the aberrant RHA was conservative(97.0%);however, patients undergoing aberrant RHA division without reconstruction did not develop liver or biliary complications. No differences in postoperative morbidity or long-term oncological related overall survival were reported in all the included studies when comparing MIPD in patients with standard anatomy to those with aberrant RHA. Conclusions: MIPD in patients with aberrant RHA is feasible without increase in morbidity and mortality. As preoperative strategy is crucial, we suggested planning an MIPD with an anomalous RHA focusing on preoperative vascular aberrancy assessment and different strategies to reduce the risk of liver ischemia.

关键词： Pancreatic cancer Pancreaticoduodenectomy Hepatic artery Superior mesenteric artery

Effect of frequency and flexibility ratio on the seismic response of deep tunnels

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Underground Space 2017年第2期2卷 125-133页

作者： Eimar Sandoval antonio Bobet Lyles School of Civil Engineering Purdue UniversityWest Lafayette 47906United States School of Civil Engineering and GeomaticsUniversidad del ValleCaliColombia

Two-dimensional dynamic numerical analyses have been conducted,using FLAC 7.0,to evaluate the seismic response of underground structures located far from the seismic source,placed in either linear-elastic or nonlinear elastoplastic *** interaction between the ground and deep circular tunnels with a tied interface is *** the simulations,it is assumed that the liner remains in its elastic regime,and plane strain conditions apply to any cross section perpendicular to the tunnel *** elastoplastic constitutive model is implemented in FLAC to simulate the nonlinear *** effect of input frequency and relative stiffness between the liner and the ground,on the seismic response of tunnels,is *** response is studied in terms of distortions normalized with respect to those of the free field,and load demand(axial forces and bending moments)in the *** all cases,*** linear-elastic and nonlinear ground models,the results show negligible effect of the input frequency on the distortions of the cross section,for input frequencies smaller than 5 Hz;that is for ratios between the wave length and the tunnel opening(k=D)larger than ten for linear-elastic and nine for nonlinear *** normalized distortions are obtained for the nonlinear than for the linear-elastic ground,for the same relative stiffness,with differences increasing as the tunnel becomes more flexible,or when the amplitude of the dynamic input shear stress *** has been found that normalized distortions for the nonlinear ground do not follow a unique relationship,as it happens for the linear-elastic ground,but increase as the amplitude of the dynamic input *** loading in the liner decreases as the structure becomes more flexible with respect to the ground,and is smaller for a tunnel placed in a stiffer nonlinear ground than in a softer nonlinear ground,for the same flexibility ratio.

关键词： Deep circular tunnel Dynamic numerical analysis Flexibility ratio Distortion Seismic response

Nanoplasmonic colloidal suspensions for the enhance-ment of the luminescent emission from single-walled carbon nanotubes

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Nano Research 2013年第8期6卷 593-601页

作者： Mareen Glaeske antonio Setaro Department of Physics Freie Universit~t Berlin Amimallee 14 1419S Berlin Germany

Aiming to enhance the luminescence yield of carbon nanotubes, we introduce a new class of hybrid nanoplasmonic colloidal systems （π-hybrids）. Nanotubes dispersed in gold nanorod colloidal suspensions yield hybrid structures exhibiting enhanced luminescence up to a factor of 20. The novelty of the proposed enhancement mechanism relies on including metal proximity effects in addition to its localized surface plasmons. This simple, robust and flexible technique enhances the luminescence of nanotubes with chiralities whose enhancement has never reported before, for example the （8,4） tube.

关键词： carbon nanotubes luminescence enhancement gold nanorods nanoplasmonic colloids hybrid structures

Modular Filter Convergence Theorems for Urysohn Integral Operators and Applications

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Acta Mathematica Sinica,English Series 2013年第6期29卷 1055-1066页

作者： antonio BOCCUTO Xenofon DIMITRIOU Dipartimento di Matematica e Informatica via Vanvitelli Department of Mathematics University of Athens Panepistimiopolis

We prove some versions of modular convergence theorems for nonlinear Urysohn-type integral operators with respect to filter convergence. We consider pointwise filter convergence of functions giving also some applicati... 详细信息

关键词： Egorov filter Lebesgue filter filter convergence filter exhaustiveness filter singularity integral operator Mellin operator modular convergence modular space

Probing the Young＇s modulus and Poisson＇s ratio in graphene/metal interfaces and graphite： A comparative study

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Nano Research 2015年第6期8卷 1847-1856页

作者： antonio Politano Gennaro Chiarello Dipartimento di Fisica Universita della Calabria Rende (CS) 87036 Italy Consorzio Nazionale In teruniversitario per le Scienze Fisiche della Matefia (CNISM) Via della Vasca Navale 84 00146 Roma Italy

By analyzing phonon dispersion, we have evaluated the average Young＇s modulus and Poisson＇s ratio in graphite and in graphene grown on Ru（0001）, Pt（111）, Ir（111）, Ni（111）, and BC3/NbB2（0001）. In both flat and corrugated graphene sheets and in graphite, we find a Poisson＇s ratio of 0.19 and a Young＇s modulus of 342 N/m. The unique exception is graphene/Ni（111）, for which we find different values because of the stretching of C-C bonds occurring in the commensurate overstructure （0.36 and 310 N/m for the Poisson＇s ratio and Young＇s modulus, respectively）. Such findings are in excellent agreement with calculations performed for a free-standing graphene membrane. The high crystalline quality of graphene grown on metal substrates leads to macroscopic samples with high tensile strength and bending flexibility for use in technological applications such as electromechanical devices and carbon-fiber reinforcements.

关键词： Young's modulus Poisson's ration elastic properties graphene