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OpenStreetMap data quality enrichment through awareness raising and collective action tools——experiences from a European project

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Geo-Spatial Information Science 2018年第3期21卷 234-246页

作者： Amin Mobasheri alexander Zipf Louise Francis GIScience Research Group Institute of GeographyHeidelberg UniversityHeidelbergGermany Mapping for Change(Co.Ltd.) LondonUnited Kingdom

Nowadays,several research projects show interest in employing volunteered geographic information(VGI)to improve their systems through using up-to-date and detailed *** European project CAP4Access is one of the successful examples of such international-wide research projects that aims to improve the accessibility of people with restricted mobility using crowdsourced *** this project,OpenStreetMap(OSM)is used to extend OpenRouteService,a well-known routing ***,a basic challenge that this project tackled was the incompleteness of OSM data with regards to certain information that is required for wheelchair accessibility(*** information,kerb data,etc.).In this article,we present the results of initial assessment of sidewalk data in OSM at the beginning of the project as well as our approach in awareness raising and using tools for tagging accessibility data into OSM database for enriching the sidewalk data *** experiments have been carried out in different European cities,and discussion on the results of the experiments as well as the lessons learned are *** lessons learned provide recommendations that help in organizing better mapping party events in the *** conclude by reporting on how and to what extent the OSM sidewalk data completeness in these study areas have benefited from the mapping parties by the end of the project.

关键词： Accessibility OpenStreetMap(OSM) data quality data completeness sidewalk wheel map

Do people communicate about their whereabouts? Investigating the relation between user-generated text messages and Foursquare check-in places

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Geo-Spatial Information Science 2018年第3期21卷 159-172页

作者： Ming Li Rene Westerholt alexander Zipf Institute of Geography Heidelberg UniversityHeidelbergGermany

The social functionality of places(***,restaurant)partly determines human behaviors and reflects a region’s functional *** descriptions of places are thus valuable to a range of studies of humans and geographic *** their potential impacts on human verbalization behaviors,one possibility is to link the functions of places to verbal representations such as users’postings in location-based social networks(LBSNs).In this study,we examine whether the heterogeneous user-generated text snippets found in LBSNs reliably reflect the semantic concepts attached with check-in *** investigate Foursquare because its available categorization hierarchy provides rich a-priori semantic knowledge about its check-in places,which enables a reliable verification of the semantic concepts identified fromuser-generated text snippets.A latent semantic analysis is conducted on a large Foursquare check-in *** results confirm that attached text messages can represent semantic concepts by demonstrating their large correspondence to the official Foursquare venue *** further elaborate the representativeness of text messages,this work also performs an investigation on the textual terms to quantify their abilities of representing semantic concepts(i.e.,representativeness),and another investigation on semantic concepts to quantify how well they can be represented by text messages(i.e.,representability).The results shed light on featured terms with strong locational characteristics,as well as on distinctive semantic concepts with potentially strong impacts on human verbalizations.

关键词： Text mining latent semantic analysis semantic concepts Foursquare location-based social network(LBSN)

New characterizations of finite supersoluble groups

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Science China Mathematics 2008年第5期51卷 827-841页

作者： alexander N SKIBA Department of Mathematics Gomel State University of F.Skorina

Let A be a subgroup of a group G and X a nonempty subset of G. A is called an X-semipermutable subgroup of G if A has a supplement T in G such that for every subgroup T 1 of T there exists an element x ∈ X such that ... 详细信息

关键词： finite groups supplement 2-maximal subgroups X-semipermutable supersoluble groups 20D10

Texture-based latent space disentanglement for enhancement of a training dataset for ANN-based classification of fruit and vegetables

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Information Processing in Agriculture 2023年第1期10卷 85-105页

作者： Khurram Hameed Douglas Chai alexander Rassau School of Engineering Edith Cowan University270 Joondalup DriveJoondalup WA 6027PerthAustralia

The capability of Convolutional Neural Networks(CNNs)for sparse representation has significant application to complex tasks like Representation Learning(RL).However,labelled datasets of sufficient size for learning this representation are not easily *** unsupervised learning capability of Variational Autoencoders(VAEs)and Generative Adversarial Networks(GANs)provide a promising solution to this issue through their capacity to learn representations for novel data samples and classification *** this research,a texture-based latent space disentanglement technique is proposed to enhance learning of representations for novel data samples.A comparison is performed among different VAEs and GANs with the proposed approach for synthesis of new data *** different VAE architectures are considered,a single layer dense VAE and a convolution based VAE,to compare the effectiveness of different architectures for learning of the *** GANs are selected based on the distance metric for disjoint distribution divergence estimation of complex representation learning *** proposed texture-based disentanglement has been shown to provide a significant improvement for disentangling the process of representation learning by conditioning the random noise and synthesising texture rich images of fruit and vegetables。

关键词： Information Maximisation(IM) Fruit and vegetables classification Representation Learning(RL) Variational Autoencoder(VAE) Generative Adversarial Network (GAN) Latent space disentanglement

Varicocele and testicular function

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Asian Journal of Andrology 2015年第4期17卷 659-667页

作者： alexander W Pastuszak Center for Reproductive Medicine Baylor College of Medicine Houston TX USA Scott Department of Urology Bay or Co ege of Medicine Houston TX USA Divisionof Urology University of Texas Med ca School at Houston Houston TX USA Department of Urology University of Texas MD Anderson Cancer Center HoustonTX USA

Testicular varicocele, a dilation of the veins of the pampiniform plexus thought to increase testicular temperature via venous congestion, is commonly associated with male infertility. Significant study has clarified the negative impact of varicocele on semen parameters and more recent work has shed light on its detrimental effects on the molecular and ultrastructural features of sperm and the testicular microenvironment, as well as more clearly defined the positive impacts of treatment on couples＇ fertility. The relationship between varicocele and testicular endocrine function, while known for some time based on histologic evaluation, has become more apparent in the clinical setting with a growing link between varicocele and hypogonadism. Finally, in the pediatric setting, while future study will clarify the impact of varicocele on fertility and testicular function, recent work supports a parallel effect of varicocele in adolescents and adults, suggesting a re-evaluation of current treatment approaches in light of the progressive nature of the condition and potential increased risk of future disease.

关键词： hypogonadism Leydig cell male fertility oxidative stress Sertoli cell ultramorphology varicocele

Architecture of Graphics System with 3D Acceleration Support for Embedded Operating Systems

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Tsinghua Science and Technology 2024年第3期29卷 863-873页

作者： alexander Giatsintov Kirill Mamrosenko Pavel Bazhenov Center of Visualization and Sattelite Information Technologies Scientific Research Institute for System Analysis of the Russian Academy of Sciences(SRISA RAS)Moscow 117218Russia

An increasing number of tasks now require the use of hardware accelerators to reduce the time required for computation and display the computational *** paper presents a new graphics system architecture for operating systems(OSs)with microkernel architecture,including real-time *** proposed system architecture provides capabilities for displaying graphical images on various information display devices and for accelerating graphical operations on *** architecture of the graphics system uses a concept of allocators to manage system and video memory,provides an abstraction of memory operations with a single interface for video memory management,and simplifies memory handling where incorrect operation is the cause of many failures.A comparison between the performance of a real-time OS and Linux OS implementing the graphics system using the example of a glmark2 benchmark is presented,thereby the superiority of the proposed architecture in several scenarios is demonstrated.

关键词： real-time operating system(RTOS) graphics system rendering system architecture operatingsystem visualization system programming

Graph-based structural joint pose estimation in non-line-of-sight conditions

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Earthquake Engineering and Engineering Vibration 2023年第2期22卷 371-386页

作者： alexander Thoms Zaid Al-Sabbag Sriram Narasimhan Department of Mechanical and Aerospace Engineering University of California-Los AngelesUSA Department of Civil and Environmental Engineering University of WaterlooCanada Department of Civil and Environmental Engineering University of California-Los AngelesUSA

In post-earthquake surveys,it is difficult(and often infeasible)to observe and quantify displacements beyond line-of-sight(LOS),given seismic force-resisting and gravity systems exist completely or partially within a building′s *** overcome this limitation,we develop a novel framework that generalizes graph-based state estimation towards structural joint localization via engineered *** landmarks provide an indirect means to estimate residual displacements where direct LOS is *** our framework,engineered landmarks define topologies of uniquely identifiable landmarks that are either visible or non-visible to a robot performing simultaneous localization and mapping(SLAM).Within the SLAM approach,factors encoding robot odometry and robot-to-visible landmark measurements are formulated for the cases of wireless sensing and fiducial object detection and *** landmarks are rigidly attached to non-visible landmark subsets for each engineered landmark,where the complete set of non-visible landmarks form globally rigid and localizable connectivity graphs via range-based *** subsets of non-visible landmarks are embedded within the base structure and uniquely define joint pose via geometric *** factors are unified within a common graph to solve for the maximum a posteriori estimate of robot,landmark,and joint states via nonlinear least squares *** demonstrate the applicability of our approach,we apply the Monte Carlo method over a parameterization of system noise to calculate residual joint pose error distributions,maximum average inter-story drift ratios,and related summary statistics for a 19-story nonlinear structural *** performing nonlinear time history analyses over sets of service-level and maximum considered earthquakes,our parametric study gives insight into our method′s application towards post-earthquake building evaluation in non-LOS conditions.

关键词： state estimation engineered landmarks post-earthquake residual displacement

Nose-to-brain drug delivery approach：a key to easily accessing the brain for the treatment of Alzheimer＇s disease

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Neural Regeneration Research 2018年第12期13卷 2102-2104页

作者： Amit alexander Shailendra Saraf Rungta College of Pharmaceutical Sciences and Research Bhilai Chhattisgarh India Durg University Govt. Vasudev Vaman Patankar Girls' P.G.College Campus Raipur Naka Durg Chhattisgarh India University Institute of Pharmacy Pt. Ravishankar Shukla University Raipur Chhattisgarh India

Alzheimer＇s disease（AD）：AD,a neurodegenerative disorder and a significant cause of dementia throughout the world mostly affects the older adults but sometimes also seen in young age（early state AD）（Agrawal et a... 详细信息

关键词： Nose-to-brain drug delivery approach:a key to easily accessing the brain for the treatment of Alzheimer’s disease AD NGF

On Evidence-Based Practice in Disaster Risk Reduction

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International Journal of Disaster Risk Science 2021年第6期12卷 919-927页

作者： David E.alexander Institute for Risk and Disaster Reduction University College LondonLondon WCIE 6BTUK

Disaster science and scholarship are forever expanding and there are increasing calls to base disaster risk reduction policies on the evidence produced by such *** examples and argument,this opinion piece examines the nature of *** defines evidence-based practice and considers how it has developed and become important to disaster risk reduction.A definition of what constitutes evidence is difficult to achieve but it must be made in relation to whether the data and information collected can usefully be interpreted and employed to change things for the *** histories from past and present centuries show that evidence can sometimes be argued over *** other cases it is roundly *** yet other instances,false conclusions derived from evidence can become evidence in their own ***,there are situations in disaster risk reduction in which evidence is sorely needed but is clearly *** effectiveness of counter-terrorism measures is one such *** conclusion,evidence is valuable,above all if there is willingness to use it to support policy formulation,especially in a simple,transparent *** interpretation can never be entirely removed from the use of evidence,and evidence alone will not stimulate the policy formulators to improve their decision making.

关键词： Case histories Disaster risk reduction Evidence-based practice Policy formulation