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Mesh Generation for Atmospheric Boundary Layer Simulation in Wind Farm Design and Management

Procedia engineering 2015年 124卷 239-251页

作者： A. Gargallo-Peiró M. Avila H. Owen L. Prieto A. Folch Dpt. Computer Applications in Science and Engineering Barcelona Supercomputing Center C/ Gran Capitán 2-4 08034 Barcelona Spain Energy Resource Dpt. Iberdrola Renovables Energía C/ Tomás Redondo 1 28033 Madrid Spain

We propose a new automatic procedure to generate hybrid meshes to simulate turbulent flows for wind farm design and management. In particular, numerical modeling of wind farms involves a RANS simulation of the Atmospheric Boundary Layer (ABL) flow and modeling the turbines using the actuator disc theory. Therefore, the generated meshes have to fulfill several geometrical requirements to answer to the different modeling features. They must: capture the topography features that can influence the wind flow; have a boundary layer close to the terrain to resolve the ABL; be conformally adapted to the disc (turbine) to simulate the turbine effects on the wind flow; be adapted around the disc to capture the wake effect; and present a smooth mesh size transition around the disc to conform the mesh size of the ABL mesh, in which the turbines are immersed. We highlight that the mesh generation procedure is fully automatic once given the mesh size, a topography description, the wind inflow direction, a list of turbine insertion points, and the turbine models. To illustrate the applicability of the proposed procedure, we present two wind farm cases: an offshore wind farm mesh where we illustrate the computed wind deficit, and an onshore farm assimilating real topography data.

关键词： hybrid meshes hexahedral meshes quadrilateral meshes mesh optimization wind farm wind turbine atmospheric boundary layer

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MSNER: A Multilingual Speech Dataset for Named Entity Recognition

arXiv

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arXiv 2024年

作者： Meeus, Quentin Moens, Marie-Francine Van Hamme, Hugo LIIR Lab Computer Science Dpt. KU Leuven Belgium PSI Electrical Engineering Dpt. KU Leuven Belgium

While extensively explored in text-based tasks, Named Entity Recognition (NER) remains largely neglected in spoken language understanding. Existing resources are limited to a single, English-only dataset. This paper addresses this gap by introducing MSNER, a freely available, multilingual speech corpus annotated with named entities. It provides annotations to the VoxPopuli dataset in four languages (Dutch, French, German, and Spanish). We have also releasing an efficient annotation tool that leverages automatic pre-annotations for faster manual refinement. This results in 590 and 15 hours of silver-annotated speech for training and validation, alongside a 17-hour, manually-annotated evaluation set. We further provide an analysis comparing silver and gold annotations. Finally, we present baseline NER models to stimulate further research on this newly available dataset. © 2024, CC BY.

关键词： Silver

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Automated Chinese Language Proficiency Scoring by utilizing Siamese Convolutional Neural Network and fusion based approach 6

Automated Chinese Language Proficiency Scoring by utilizing ...

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6th International Conference on engineering and Emerging Technologies, ICEET 2020

作者： Kwong, Anne Muzamal, Junaid Hussain Zhang, Patrick Yu Lin, Guimin Dpt. Research and Development Digital Galaxy Technologies Limited Honkkong Guangdong Sheng China Al-Khawarizmi Institute of Computer Science KICS University of Engineering and Technology Lahore Lahore Pakistan

ISBN: (纸本)9781728145792

The previous approaches have failed to effectually score the language proficiency of a non-native speakers especially in case of non-English languages which are complex and a slight change of pronunciation can alter the nature of the word. In this study, we proposed an automated language scoring system to test the proficiency of Chinese language. We have employed a novel fusion approach of a 38-feature based model and a Siamese convolutional neural network (Siamese CNN) which can accuracy identify the difference between the native speech and the test taker's speech. The results show that out model have achieved comparable performance to the state of the art and solved the pronunciation problems as well. Furthermore, we have provided a fusion based approach and provided extensive amount of experiments which shows that our method is state of the art and can be utilized in real time Chinese language proficiency scoring. © 2020 IEEE.

关键词： Convolutional neural networks

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Bitcoin Message: Data Insertion on a Proof-of-Work Cryptocurrency System

Bitcoin Message: Data Insertion on a Proof-of-Work Cryptocur...

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International Conference on Cyberworlds

作者： Matthew D. Sleiman Adrian P. Lauf Roman Yampolskiy Dpt. of Computer Engineering and Computer Science University of Louisville Louisville Kentucky USA

The Bit coin currency is steadily growing in popularity as an alternative to physical currencies. This paper presents an approach for utilizing the Bit coin system for creating permanent messages that are located on computers worldwide. By manipulating the amount field of Bit coin transactions, messages can be embedded into the Bit coin block chain. This approach was implemented by extending the Bit coin-Qt v0.7.2 application and the source code is freely available.

关键词： Online banking Encoding Peer-to-peer computing Cryptography computers Internet Decoding

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Bayesian classification and active learning using lp-priors. Application to image segmentation 22

Bayesian classification and active learning using lp-priors....

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22nd European Signal Processing Conference, EUSIPCO 2014

作者： Ruiz, Pablo De La Blanca, Nicolás Pérez Molina, Rafael Katsaggelos, Aggelos K. Dept. Ciencias de la Computación e I.A. Universidad de Granada Spain Dpt. of Electrical Engineering and Computer Science Northwestern University United States

ISBN: (纸本)9780992862619

In this paper we utilize Bayesian modeling and inference to learn a softmax classification model which performs Supervised Classification and Active Learning. For p p-priors are used to impose sparsity on the adaptive parameters. Using variational inference, all model parameters are estimated and the posterior probabilities of the classes given the samples are calculated. A relationship between the prior model used and the independent Gaussian prior model is provided. The posterior probabilities are used to classify new samples and to define two Active Learning methods to improve classifier performance: Minimum Probability and Maximum Entropy. In the experimental section the proposed Bayesian framework is applied to Image Segmentation problems on both synthetic and real datasets, showing higher accuracy than state-of-the-art approaches. © 2014 EURASIP.

关键词： Image segmentation

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Query expansion with a little help from twitter

Communications in Computer and Information Science

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Communications in computer and Information science 2013年 384卷 20-29页

作者： Anagnostopoulos, Ioannis Razis, Gerasimos Mylonas, Phivos Anagnostopoulos, Christos-Nikolaos Computer Science and Biomedical Informatics Dpt. University of Thessaly Greece Electrical and Computer Engineering School National Technical University of Athens Greece Cultural Technology and Communication Dpt. University of the Aegean Greece

With the advent and rapid spread of microblogging services, web information management finds a new research topic. Although classical information retrieval methods and techniques help search engines and services to present an adequate precision in lower recall levels (top-k results), the constantly evolving information needs of microblogging users demand a different approach, which has to be adapted to the dynamic nature of On-line Social Networks (OSNs). In this work, we use Twitter as microblogging service, aiming to investigate the query expansion provision that can be extracted from large graphs, and compare it against classical query expansion methods that require mainly prior knowledge, such as browsing history records or access and management of search logs. We provide a direct comparison with mainstream media services, such as Google, Yahoo!, Bing, NBC and Reuters, while we also evaluate our approach by subjective comparisons in respect to the Google Hot Searches service. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Social networking (online)

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Toward Secure Consumer IoT Communications using DNA Encryption and Blockchain Technology

Toward Secure Consumer IoT Communications using DNA Encrypti...

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International Conference on Pattern Analysis and Intelligent Systems (PAIS)

作者： Ankush Verma Geetanjali Rathee Chaker Abdelaziz Kerrache Dpt. of Computer Science and Engineering Netaji Subhas University of Technology New Delhi India Dpt. of Computer Science Université Amar Telidji de Laghouat Laghouat Algeria

ISBN: (数字)9798350350265

ISBN: (纸本)9798350350272

Recently, the Internet of Things (IoT) has gained widespread popularity, yet its security remains a critical challenge due to the massive amount of information generated by connected devices. While encryption algorithms are commonly employed to protect this information, they are susceptible to various attacks. This paper introduces a novel encryption method to enhance data security in the Consumer IoT domain. The proposed approach combines DNA-inspired encryption with blockchain technology. The DNA encryption algorithm is utilized for the primary encryption phase, followed by the secure handling of encrypted data using blockchain. To evaluate the proposed scheme, a comparison is made with traditional techniques such as RSA, DNA, and a hybrid of both, considering encryption and decryption times. Simulations are conducted using MATLAB software, and an analytical study is performed to assess the performance of the suggested scheme.

关键词： Smart cities Software algorithms DNA Medical services Software Encryption Blockchains

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Towards an Efficient and Secure Cache Management Using Apriori-Based Interests Prediction in Named Data Networking

Towards an Efficient and Secure Cache Management Using Aprio...

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Intelligent Systems and Embedded Design (ISED), International Conference on

作者： Chaker Abdelaziz Kerrache Geetanjali Rathee Younes Guellouma Hocine Gasmi Benameur Ziani Dpt. of Computer Science Université Amar Telidji de Laghouat Laghouat Algeria Dpt. of Computer Science and Engineering Netaji Subhas University of Technology New Delhi India

Cache management is an important component in any network and it has even more importance in the Future Internet Architectures (FIAs) including Named Data Networking (NDN), because the caches play the key role in reducing the overall network latency and scalability. In this paper, we discuss the functionality of cache management in NDN, its types as well as its importance for the NDN architecture. In addition, we propose a machine learning-empowered cache management and interests predication for NDN to only preserve the cache only to the secure and really needed data. Our proposal uses Apriori algorithm which is supervised learning algorithm to find the association rules and then to recommend the next requested data. Implementation and experiments on real data traffic depicted that the network’ performance and its influence on the cache increased by 3.2% for two content store sizes of 20 and 40 MB. In addition, a larger cache size of 80 MB shows an increase of the cache hit ratio reaching 90% and hence, clearly reducing the network latency.

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Causal and Anticipative Models for the Dimensioning of 3G Multiservice Networks

Causal and Anticipative Models for the Dimensioning of 3G Mu...

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IEEE Global Telecommunications Conference GLOBECOM'03

作者： Jaumard, Brigitte Meyer, Christophe Pooyania, Raha Solari, Yannick Voisin, Catherine Dpt. of Computer Science Université de Montréal Montréal Que. H3C 3J7 Canada Dpt. of Electrical Engineering Ecl. Polytech. de Montreal Montréal Que. H3C 3A7 Canada

We study mathematical models and discuss optimization algorithms for the dimensioning of 3G multimedia networks. We propose two models which aims at dimensioning networks with both a radio and a core component. The first one is an anticipative one in which we assume that we know a priori the traffic over the planning period and the dimensioning is defined with a best possible call admission control procedure. The second one is a causal one in which we define an explicit call admission control procedure which makes the accept/reject decisions without any knowledge on the forthcoming traffic. We then compare, on an experimental basis, the dimensioning obtained by both models on some multi-service networks.

关键词： Telecommunication networks

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Automated language scoring system by employing neural network approaches 15

Automated language scoring system by employing neural networ...

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15th International Conference on Emerging Technologies, ICET 2019

作者： Kwong, Anne Muzamal, Junaid Hussain Khan, Usman Ghani Digital Galaxy Technologies Limited China Dpt. Research and Development Honkkong Guangdong Sheng China Kics University of Engineering and Technology Lahore Pakistan University of Engineering and Technology Dept. of Computer Science Lahore Pakistan

ISBN: (纸本)9781728154039

Present approaches of automated language scoring lack the ability to investigate the multiple-level and several contexts of sequential features which are helpful to examine the language proficiency for the responses (monologue and dialogue). This paper aimed to identify the different levels of sequential features with respect to various contexts to evaluate the speaker's proficiency of a language. We have employed Neural Network based automated assessment. We have combined 3 attention based Bidirectional Long-Short-Term-Memory to effectively consider the three dimensions of a speech as delivery, grammar and content. The resultant outcomes demonstrated that our methodology have outperformed the traditional ways of language scoring. © 2019 IEEE.

关键词： Long short-term memory

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