检索结果-内蒙古大学图书馆

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

来源：评论

学校读者我要写书评

暂无评论

MULTIFRAME BLIND DECONVOLUTION OF PASSIVE MILLIMETER WAVE IMAGES USING VARIATIONAL DIRICHLET BLUR KERNEL ESTIMATION

MULTIFRAME BLIND DECONVOLUTION OF PASSIVE MILLIMETER WAVE IM...

引用

IEEE International Conference on Image Processing

作者： Javier Mateos Antonio Lopez Miguel Vega Rafael Molina Aggelos K. Katsaggelos Dpt. de Ciencias de la Computacion e I. A. Univ. de Granada Dpt. de Lenguajes y Sistemas Informaticos Univ. de Granada Dpt. of Electrical Engineering and Computer Science Northwestern University

ISBN: (纸本)9781467399623

Passive Millimeter Wave Images currently used to detect hidden threats suffer from low resolution, blur, and a very low signal-to-noise-ratio. These shortcomings render threat detection, both visual and automatic, very challenging. Furthermore, due to the presence of very severe noise, most of the blind image restoration methods fail to recover the system blurring kernel from a single image. In this paper we propose a robust Bayesian multiframe blind image deconvolution method that approximates the posterior distribution of the blur by a Dirichlet distribution. We show that this approach naturally incorporates the non-negativity and normalization constraints for the blur and cope well with the image noise. The performance of the proposed method is tested on both synthetic and real images.

关键词： Passive millimeter wave imaging Blind image deconvolution Variational Dirichlet images deconvolution millimetre wave imaging Seeds blind deconvolution waves waveforms Posterior distribution image noise Blind multiframe

来源：评论

学校读者我要写书评

暂无评论

UlsaNA: Universal language semantic analyzer 12

UlsaNA: Universal language semantic analyzer

引用

12th International Conference on Recent Advances in Natural Language Processing, RANLP 2019

作者： Pražák, Ondřej Konopík, Miloslav NTIS Faculty of Applied Sciences University of West Bohemia Technická 8 Plzeň306 14 Czech Republic Dpt. of Computer Science and Engineering Faculty of Applied Sciences University of West Bohemia Technická 8 Plzeň306 14 Czech Republic

ISBN: (纸本)9789544520557

We present a live cross-lingual system capable of producing shallow semantic annotations of natural language sentences for 51 languages at this time. The domain of the input sentences is in principle unconstrained. The system uses single training data (in English) for all the languages. The resulting semantic annotations are therefore consistent across different languages. We use CoNLL Semantic Role Labeling training data and Universal dependencies as the basis for the system. The system is publicly available and supports processing data in batches;therefore, it can be easily used by the community for research tasks. © 2019 Association for Computational Linguistics (ACL). All rights reserved.

关键词： Deep learning

来源：评论

学校读者我要写书评

暂无评论

DESIGN OF COGNITIVE RADIO systems UNDER TEMPERATURE-INTERFERENCE CONSTRAINTS: A VARIATIONAL INEQUALITY APPROACH

DESIGN OF COGNITIVE RADIO SYSTEMS UNDER TEMPERATURE-INTERFER...

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： Jong-Shi Pang Gesualdo Scutari Daniel P. Palomar Francisco Facchinei Dpt. of Industrial and Enterprise Systems Eng. University of Illinois at Urbana-Champaign Urbana USA Dpt. of Electronic and Computer Eng. Hong Kong Univ. of Science and Technology Hong Kong Dpt. of Computer and System Sciences Antonio Ruberti Sapienza Univ. of Rome Rome Italy

ISBN: (纸本)9781424442959

The concept of cognitive radio has recently received great attention from the research community as a promising paradigm to achieve efficient use of the frequency resource by allowing the coexistence of primary and secondary users in the same bandwidth. In this paper, we propose a novel Nash equilibrium (NE) problem to model concurrent communications of cognitive secondary users who compete with each other to maximize their information rate, subject to constraints on the transmit power (and possibly spectral masks) as well as on per-carrier and total aggregate interference tolerable at the primary users' receivers. The coupling among the strategies of the players due to the interference constraints presents a new challenge for the analysis of this class of Nash games that cannot be addressed using the game theoretical models proposed in the literature. For this purpose, we need the framework given by the more advanced theory of finite-dimensional Variational Inequalities. This provides us with all the mathematical tools necessary to analyze the proposed NE problem (e.g., existence and uniqueness of the solution) and to devise alternative distributed algorithms along with their convergence properties.

关键词： Cognitive radio game theory variational inequality distributed algorithms temperature-interference constraints distributed algorithms Cognitive radio Game theory Radio systems Transmitter power Interference constraints

来源：评论

学校读者我要写书评

暂无评论

PaperMill Detection in Scientific Content

PaperMill Detection in Scientific Content

引用

International Workshop on Semantic Media Adaptation and Personalization (SMAP)

作者： Gerasimos Razis Konstantinos Anagnostopoulos Omiros Metaxas Stefanos-Dimitrios Stefanidis Hong Zhou Ioannis Anagnostopoulos Atypon Systems LLC California United States Computer Science and Biomedical Informatics Dpt. University of Thessaly Lamia Greece

Researchers often come under pressure when facing the ever-increasing demand to produce a progressive number of publications, resorting to hiring the services of paper mills. These are unofficial, and often illegitimate, organizations providing ready-made questionable research components and services, posing a threat to the research integrity, scientific ecosystem, and publishers. Identifying paper mill material is a challenging and laborious process, while the increasing number of Artificial Intelligence services generating human-like text obstructs this process. The purpose of this paper is to contribute to the research integrity domain by proposing the PaperMill Detection manuscript screening framework. By leveraging contextual signals, it measures the probability of a document being the result of a paper mill organization or generated by Artificial Intelligence. The combination of these signals can facilitate the detection of questionable scientific content. Our evaluation has revealed that the proposed approach outperforms other open-source and commercial solutions in all examined evaluation metrics, achieving an F1 score of 0.97.

关键词：

来源：评论

学校读者我要写书评

暂无评论

On partitioning-based optimisations in expressive fuzzy Description Logics

On partitioning-based optimisations in expressive fuzzy Desc...

引用

IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： Fernando Bobillo Umberto Straccia Dpt. of Computer Science and Systems Engineering University of Zaragoza Spain ISTI-CNR Istituto di Scienza e Tecnologie dell' Informazione Pisa Italy

Fuzzy Description Logics (DLs) are a formalism for the representation of structured knowledge affected by imprecision or vagueness. A key factor in the practical success of fuzzy DLs is the availability of highly implemented reasoners. This paper studies two optimisation techniques (ABox partitioning based on individual groups and optimisation problem partitioning) in the setting of the fuzzy ontology reasoner fuzzy DL. We study the applicability of these techniques in expressive fuzzy DL languages, proposing a new strategy, and perform an empirical evaluation proving that they are not helpful in practice so far.

关键词： Optimization Semantics Cognition Fuzzy logic Description logic Standards

来源：评论

学校读者我要写书评

暂无评论

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...

引用

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

来源：评论

学校读者我要写书评

暂无评论

Spline-type solution to parameter-dependent LMIs

Spline-type solution to parameter-dependent LMIs

引用

IEEE Conference on Decision and Control

作者： I. Masubuchi A. Kume E. Shimemura Dpt. of Computer and Systems Engmeering Kobe University Kobe Japan School of Information Science Japan Advanced Institute of Science and Technology Ishikawa Japan

Parameter-dependent quadratic forms (PDQF) play an important role in analysis and synthesis of linear parameter varying (LPV) systems. This paper proposes a method to find a PDQF that meets some criterion written in terms of LMI guaranteeing performances of LPV systems. Through approximation of PDQF with spline functions, we derive finite number of LMI from a given LMI-criterion on a PDQF, which is inherently a condition with infinitely many inequalities. This approximating solution to LMI on a PDQF is proved to have the following properties: (1) any solution to the derived LMI of finite number always produces a PDQF satisfying the original LMI-criterion, and (2) the finite LMI-condition always holds with sufficiently fine division of the parameter's region if the original one is solvable. Thus the results of this paper enable to solve parameter-dependent LMI associated with PDQF without conservatism.

关键词： Spline Stability criteria Information science Lyapunov method Control design Concrete Finite element methods Performance gain Linear matrix inequalities

来源：评论

学校读者我要写书评

暂无评论

Subdividing triangular and quadrilateral meshes in parallel to approximate curved geometries

引用

Procedia engineering 2017年 203卷 310-322页

作者： A. Gargallo-Peiró G. Houzeaux X. Roca Computer Applications in Science and Engineering Dpt. Barcelona Supercomputing Center-Centro Nacional de Supercomputación C/ Jordi Girona 29 Barcelona 08034 Spain

A parallel distributed approach to refine a mesh while preserving the curvature of a target geometry is presented. Our approach starts by generating a coarse linear mesh of the computational domain. Second, the former coarse mesh is curved to match the curvature of the target geometry. Then, the curved mesh is partitioned and the subdomain meshes are sent to the slaves. Finally, the curved elements are uniformly subdivided in parallel targeting the geometry approximated by the curved mesh. The result is a distributed finer linear mesh featuring improved geometric accuracy. The key ingredient of our implementation is to approximate the target geometry as a linear mesh equipped with an elemental field corresponding to an element-wise polynomial geometry representation. Thus, the distribution of the curved geometry is equivalent to partitioning the linear mesh and sending the subdomain meshes and the elemental fields to the slaves. The main application of the obtained finer linear mesh is to compute in parallel steady state flow solutions on real topographies. The qualitative results show that for 2D and 3D steady state flow solutions, on real and synthetic topographies, our parallel subdivision approach mitigates the artificial artifacts that might appear with standard straight-sided subdivision methods. We also check the parallel performance of the implementation by performing a weak scalability test in 2D.

关键词： Mesh subdivision Mesh multiplication Parallel mesh generation Parallel computing High-order mesh

来源：评论

学校读者我要写书评

暂无评论

Fake News, Disinformation, and Deepfakes: Leveraging Distributed Ledger Technologies and Blockchain to Combat Digital Deception and Counterfeit Reality

arXiv

引用

arXiv 2019年

作者： Fraga-Lamas, Paula Fernández-Caramés, Tiago M. Dpt. of Computer Engineering Centro de investigación CITIC Faculty of Computer Science Universidade da Coruña A Coruña15071 Spain

The rise of ubiquitous deepfakes, misinformation, disinformation and post-truth, often referred to as fake news, raises concerns over the role of Internet and social media in modern democratic societies. Due to its rapid and widespread diffusion, digital deception has not only an individual or societal cost, but it can lead to significant economic losses or to risks to national security. Blockchain and other Distributed Ledger Technologies (DLTs) guarantee the provenance and traceability of data by providing a transparent, immutable and verifiable record of transactions while creating a peer-to-peer secure platform for storing and exchanging information. This overview aims to explore the potential of DLTs to combat digital deception, describing the most relevant applications and identifying their main open challenges. Moreover, some recommendations are enumerated to guide future researchers on issues that will have to be tackled to strengthen the resilience against cyber-threats on today's online media. Copyright © 2019, The Authors. All rights reserved.

关键词： Cybersecurity

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：