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Representing Urban Geometries for Unstructured Mesh Generation

Procedia engineering 2016年 163卷 175-185页

作者： Abel Gargallo-Peiró Arnau Folch Xevi Roca Dpt. Computer Applications in Science and Engineering Barcelona Supercomputing Center C/ Jordi Girona 29 08034 Barcelona Spain

We present a robust and automatic method to generate an idealized surface geometry of a city landscape ready to be meshed for computer simulations. The city geometry is idealized for non viscous flow simulations and targets two main geometrical features: the topography and the city blocks. The procedure is fully automatic and demands no human interaction given the following source data: the city cadastre, a Digital Elevation Model (DEM) of all the target domain, and Light Detection And Ranging (LiDAR) data of the domain region covered by the cadastre. The geometry representation takes three main steps. First, a 2D mesh of the cadastre is generated, where the elements are marked according to street and block regions. Second, using a DEM of the city landscape the topography surface mesh is generated by finding the best surface mesh in the least-squares sense obtained by deforming the previous 2D mesh. Third, we extrude the block facades and we compute a planar ceiling taking into account all the buildings belonging to that city block. We describe the applicability of the geometry representation by presenting the work-flow required to generate an unstructured mesh valid for non-viscous flow or transport simulations. Finally, we illustrate the main application by obtaining a surface and tetrahedral mesh for the city of Barcelona in Spain.

关键词： Surface mesh generation Unstructured mesh generation Mesh for simulation Urban area mesh Microscale CFD

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Fade-in Reverberation in Multi-room Environments Using the Common-Slope Model

arXiv

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arXiv 2024年

作者： Lee, Kyung Yun Meyer-Kahlen, Nils Götz, Georg Svensson, U. Peter Schlecht, Sebastian J. Välimäki, Vesa Acoustics Lab Dpt. of Information and Communications Engineering Aalto University Finland Dpt. of Electronic Systems Norwegian University of Science and Technology Norway Germany

In multi-room environments, modelling the sound propagation is complex due to the coupling of rooms and diverse source-receiver positions. A common scenario is when the source and the receiver are in different rooms without a clear line of sight. For such source-receiver configurations, an initial increase in energy is observed, referred to as the "fade-in" of reverberation. Based on recent work of representing inhomogeneous and anisotropic reverberation with common decay times, this work proposes an extended parametric model that enables the modelling of the fade-in phenomenon. The method performs fitting on the envelopes, instead of energy decay functions, and allows negative amplitudes of decaying exponentials. We evaluate the method on simulated and measured multi-room environments, where we show that the proposed approach can now model the fade-ins that were unrealisable with the previous method. © 2024, CC BY.

关键词： Reverberation

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Perception of meter similarity in flamenco music

Perception of meter similarity in flamenco music

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作者： Absar, Rafa Gómez, Francisco Guastavino, Catherine Marandola, Fabrice Toussaint, Godfried McGill University School of Information Studies McGill University 3459 McTavish Montreal Que. H3A 1Y1 Canada Applied Mathematics Dpt. School of Computer Science Polytechnic Univ. of Madrid Schulich School of Music School of Computer Science

The results of a listening test conducted to evaluate the perceived similarity of the five metric patterns used in flamenco music are presented. The objective of this experiment includes testing out the validity of those measures from a perceptual point of view. Dissimilarity ratings were analyzed using multi-dimensional scaling and phylogenetic analysis, and the perceptual measures of similarity were then compared with mathematical measures of rhythmic similarity used in to determine which measure best matches human judgments. The graphical interface was programmed in Java on a MacPro computer, and sounds were presented over headphones. A dissimilarity matrix was created for each participant based on their ratings, and these values were averaged for every participant to symmetrize the matrix.

关键词： Sensory perception

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Non-Parametric Bootstrap Detection of Availability Service Level Objective Violations in Cloud Storage

Non-Parametric Bootstrap Detection of Availability Service L...

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Network Traffic Measurement and Analysis Conference (TMA)

作者： Maurizio Naldi Dpt. of Civil Engineering and Computer Science University of Rome Tor Vergata Rome Italy

Service quality commitments in cloud service provisioning are typically described in Service Level Agreements (SLA). Service availability is always a major parameter to be included in such SLAs. and the cloud provider is bounded to guarantee a minimum availability value, for which current cloud monitoring systems employ a naive estimator. In this paper a new estimation method is proposed for service availability, which is based on the bootstrap technique and employs a non-parametric statistical hypothesis test. Through Monte Carlo simulation, the method is shown to be much more accurate than the naive one under three stochastic models for the durations of operating and outage periods, exhibiting a Type I error probability lower than 1 % in most cases, while the naive estimator yields error probabilities around 40%.

关键词： Cloud computing Mathematical model Computational modeling Error probability Monitoring Estimation Monte Carlo methods

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Enhancing Concept Drift Detection in Drifting and Imbalanced Data Streams through Meta-Learning

Enhancing Concept Drift Detection in Drifting and Imbalanced...

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IEEE International Conference on Big Data

作者： Gabriel Jonas Aguiar Alberto Cano Dpt. of Computer Science College of Engineering Virginia Commonwealth University Richmond VA USA

One of the biggest challenges in learning from data streams is adapting the classification model to new data. Due to the evolving nature of data streams, they are subject to a phenomenon known as concept drift that makes previously learned knowledge and model outdated. Therefore, concept drift must be efficiently detected in order to adapt the classification model. While there exists a plethora of drift detectors, with different mechanisms, selecting the most suitable for a new stream is a difficult task, since apriori knowledge may not be available and changes over time can affect the performance of the detector. This paper proposes a framework that exploits statistical and temporal meta-features from sliding windows to dynamically recommend a suitable drift detector in real-time for unseen chunks of streams according to its properties using Meta-Learning. We performed experiments on 10 real-world data streams and 18 synthetic generated data streams that were subject to concept drift and class imbalance in order to evaluate the performance of the proposed framework. Experiments exposed that the proposed approach was able to enhance the concept drift detection in a variety of scenarios demonstrating robustness to class imbalance and the advantages of dynamically selecting the drift detector.

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A power saving scheduling algorithm for multiple MSSs in large-scale IEEE 802.16e environments 10

A power saving scheduling algorithm for multiple MSSs in lar...

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6th International Wireless Communications and Mobile Computing Conference, IWCMC 2010

作者： Huang, Huai-Sheng Chen, Yu-Jen Wu, Shih-Lin Chen, Jen-Jee Dpt. of Information Management Chang Gung University Kweishan Taoyuan Taiwan Dpt. of Computer Science and Imformation Engineering Chang Gung University Kweishan Taoyuan Taiwan Department of Computer Science National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)9781450300629

Power Saving Class (PSC) is an essential issue on IEEE 802.16-2009. In previous research, many algorithms had been proposed to reduce the consumption of power, but most of them only considered multiple connections in a Mobile Subscriber Station (MSS);in fact, it does not fit in with the situation of real world. On the contrary, others proposed algorithms considering the situation of multiple MSSs with multiple connections;nevertheless, it is difficult to increase the amount of MSSs. In this paper, we propose an efficient algorithm, which refers to both categories and avoids state transitions. When packet size is much smaller or delay bound is more loosening, the result shows that our scheduling algorithm can serve almost double multiple MSSs with multiple connections and still maintain high sleep ratio for energy efficiency. Copyright © 2010 ACM.

关键词： Scheduling algorithms

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When Circular Economy Meets the Smart City Ecosystem: Defining the Smart and Circular City

When Circular Economy Meets the Smart City Ecosystem: Defini...

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IEEE International Smart Cities Conference (ISC2)

作者： Georgios Mylonas Athanasios Kalogeras Sobah Abbas Petersen Luis Muñoz Ioannis Chatzigiannakis Industrial Systems Institute Athena Research Center Patras Greece Dpt. of Computer Science Norwegian University of Science and Technology Trondheim Norway Dpt. of Communications Engineering Universidad de Cantabria Santander Spain Dpt. of Computer Control and Management Engineering Sapienza University of Rome Rome Italy

ISBN: (数字)9798350364316

ISBN: (纸本)9798350364323

Smart cities have been a very active research area in the past 20 years, while continuously adapting to new technological advancements and keeping up with the times regarding sustainability and climate change. In this context, there have been numerous proposals to expand the scope of smart cities, focusing on resilience and sustainability, among other aspects, resulting in terms like smart sustainable cities. At the same time, there is an ongoing discussion regarding the degree in which smart cities put people at their centre. In this work, we argue toward expanding the current smart city definition by integrating the circular economy as one of its central pillars and adopting the term smart (and) circular city. We discuss the ways a smart and circular city encompasses both sustainability and smartness in an integral manner, while also being well-positioned to foster novel business activity and models and helping to place citizens at the heart of the smart city. In this sense, we also argue that previous research in smart cities and technologies, such as those related to Industry 4.0, can serve as a cornerstone to implement circular economy activities within cities, at a scale that exceeds current activities that are based on more conventional approaches. We also outline current open challenges in this domain and research questions that still need to be addressed.

关键词： Heart Climate change Smart cities Ecosystems Focusing Fourth Industrial Revolution Proposals Sustainable development Resilience Business

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Cryptanalysis of TRUTH: Fixing a Protocol to Make it 5G-Compliant

Cryptanalysis of TRUTH: Fixing a Protocol to Make it 5G-Comp...

引用

2024 International Symposium on Networks, computers and Communications, ISNCC 2024

作者： Munilla, J. Burmester, M. Caballero-Gil, P. University of Málaga Dpt. of Telecommunication Engineering Málaga29071 Spain Florida State Unviersity Department of Computer Science TallahasseeFL32304 United States University of La Laguna Dept. of Computer Science and Ai Tenerife La Laguna Spain

ISBN: (纸本)9798350364910

Trust and security are critical deployment require-ments for Industrial Internet of Things (IIoT) networks. A recent protocol, called TRUTH, integrates security mechanisms for authentication and privacy alongside a Dempster-Shafer based trust model, to assess the trustworthiness of collected data. We analyze this protocol and show that it does not comply with the implementation requirements of the 5G standard, and that flaws in the identification of involved parties hinder its adoption by 5G devices. We show how to fix this protocol and tailor it for the specific 5G implementation constraints, by enhancing its computational and communication performance. Finally, we show how to prove the security of this fixed protocol (TRUTH +) using the Tamarin automated verification tool. © 2024 IEEE.

关键词： Authentication Protocol

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Automatic video colorization using 3d conditional generative adversarial networks

arXiv

引用

arXiv 2019年

作者： Kouzouglidis, Panagiotis Sfikas, Giorgos Nikou, Christophoros Dpt. of Computer Science and Engineering University of Ioannina Ioannina45110 Greece Information Technologies Institute CERTH Thessaloniki57001 Greece

In this work, we present a method for automatic colorization of grayscale videos. The core of the method is a Generative Adversarial Network that is trained and tested on sequences of frames in a sliding window manner. Network convolutional and deconvolutional layers are three-dimensional, with frame height, width and time as the dimensions taken into account. Multiple chrominance estimates per frame are aggregated and combined with available luminance information to recreate a colored sequence. Colorization trials are run succesfully on a dataset of old black-and-white films. The usefulness of our method is also validated with numerical results, computed with a newly proposed metric that measures colorization consistency over a frame sequence. Copyright © 2019, The Authors. All rights reserved.

关键词： Convolution

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When Circular Economy Meets the Smart City Ecosystem: Defining the Smart and Circular City

arXiv

引用

arXiv 2024年

作者： Mylonas, Georgios Kalogeras, Athanasios Petersen, Sobah Abbas Muñoz, Luis Chatzigiannakis, Ioannis Industrial Systems Institute Athena Research Center Patras Greece Dpt. of Computer Science Norwegian University of Science and Technology Trondheim Norway Dpt. of Communications Engineering Universidad de Cantabria Santander Spain Dpt. of Computer Control and Management Engineering Sapienza University of Rome Rome Italy

关键词： Circular economy

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