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Proceedings of the 31st International Conference on Neural Information Processing Systems

作者： Jonathan Peck Joris Roels Bart Goossens Yvan Saeys Department of Applied Mathematics Computer Science and Statistics Ghent University Ghent Belgium and Data Mining and Modeling for Biomedicine VIB Inflammation Research Center Ghent Belgium Data Mining and Modeling for Biomedicine VIB Inflammation Research Center Ghent Belgium and Department of Telecommunications and Information Processing Ghent University Ghent Belgium Department of Telecommunications and Information Processing Ghent University Ghent Belgium

ISBN: (纸本)9781510860964

The input-output mappings learned by state-of-the-art neural networks are significantly discontinuous. It is possible to cause a neural network used for image recognition to misclassify its input by applying very specific, hardly perceptible perturbations to the input, called adversarial perturbations. Many hypotheses have been proposed to explain the existence of these peculiar samples as well as several methods to mitigate them, but a proven explanation remains elusive. In this work, we take steps towards a formal characterization of adversarial perturbations by deriving lower bounds on the magnitudes of perturbations necessary to change the classification of neural networks. The proposed bounds can be computed efficiently, requiring time at most linear in the number of parameters and hyperparameters of the model for any given sample. This makes them suitable for use in model selection, when one wishes to find out which of several proposed classifiers is most robust to adversarial perturbations. They may also be used as a basis for developing techniques to increase the robustness of classifiers, since they enjoy the theoretical guarantee that no adversarial perturbation could possibly be any smaller than the quantities provided by the bounds. We experimentally verify the bounds on the MNIST and CIFAR-10 data sets and find no violations. Additionally, the experimental results suggest that very small adversarial perturbations may occur with non-zero probability on natural samples.

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An efficient intra block size decision for H.264/AVC encoding optimization 13

An efficient intra block size decision for H.264/AVC encodin...

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13th IEEE/ACS International Conference of computer Systems and Applications, AICCSA 2016

作者： Elyousfi, Abderrahmane Hamout, Hamza Hachimi, Asma El Department of Computer Science National Engineering School of Applied Sciences Ibn-Zohr University Agadir Morocco Laboratory of Computer Systems and Vision Faculty of Sciences Ibn-Zohr University Agadir Morocco Laboratory of Information Modeling and Communication Systems Faculty of Sciences Ibn-Tofail University Kenitra Morocco

The video coding standard, H.264/MPEG-4 AVC, uses variable block sizes in intra coding. This feature has achieved significant coding gain compared to coding a macroblock (MB) using fixed block size. However, this feature results in extremely high computational complexity when brute force rate distortion optimization (RDO) algorithm is used. In this paper, we propose an Efficient Intra Block Size Decision for H.264/AVC Encoding Optimization. It makes use of the spatial homogeneity characteristics of the macroblock. Specifically, spatial homogeneity of a MB is decided based on the amplitude value of the proposed MB vector. Based on the homogeneity of the macroblock, only a small number of intra prediction modes are selected in the RDO process. Different video sequences are used to test the performance of proposed method. Experimental results reveal the significant computational savings achieved with slight Peak Signal-To-Noise Ratio (PSNR) degradation and bit-rate increase. © 2016 IEEE.

关键词： Image coding

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computer simulation of transformation during TRIP steel rod drawing 16th

Computer simulation of transformation during TRIP steel rod ...

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16th Metal Forming International Conference, 2016

作者： Konstantinov, Dmitrii Bzowski, Krzysztof Korchunov, Aleksey Pietrzyk, Maciej Kuziak, Roman Nosov Magnitogorsk State Technical University Department of Design Engineering and Operation of Metallurgical Machines and Equipment Lenin Street 38 Magnitogorsk455000 Russia AGH University of Science and Technology Department of Applied Computer Science and Modeling Al. Mickiewicza 30 Kraków30-059 Poland Instytut Metalurgii Zelaza Miarki 12-14 Gliwice44-100 Poland

ISBN: (纸本)9783038357049

Axis pins, shafts and other rod-like parts are some of the main components of units and machines. They are manufactured from steel rods ranging from 7 to 60 mm in diameter after singlepass drawing. Unalloyed carbon steel grades are generally used to produce these items. TRIP steels application is advantageous in terms of achieving new properties when manufacturing steel rods. The initial billet size, the need to take account a transformation in TRIP steel microstructure and a great number of analysed technological conditions make it challenging to apply new materials into rod drawing process. The research aim is to explore the stress-strain state during rod drawing of steel TRIP700. Modified multiscale computer simulation method has been applied. The simulation method takes into account transformation of retained austenite into martensite during plastic deformation. Decreasing of the computational resource intensity and calculation time has been achieved by application of concept of Statistically Similar Representative Volume Element (SSRVE). Comparative analysis of rod drawing micromodels with and without the TRIP-effect simulation has been performed. The analysis showed that a values of equivalent strains in the deformation zone of a TRIP-ignored micromodel was three-four times lower than in a TRIPfactored micromodel. The analysis of simulation results has revealed that, due to a wide contact area with adjacent grains and interaction between microstructure elements, more intensive martensitic transformation occurred within larger grains of retained austenite. The micromodel shown that position and orientation of grains in the deformed TRIP steel microstructure are some of the factors that predetermine transformation of retained austenite. On the basis of simulation results recommendations on preparation of rod drawing conditions have been developed. Developed technological conditions provides ability to obtain: high-plasticity characteristics and high potential st

关键词： Plasticity

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A Novel Detection Intrusion Approach for Ubiquitous and Pervasive Environments

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Procedia computer science 2016年 94卷 429-434页

作者： Lynda Sellami Djilali Idoughi Abderrahman Baadache Pierre Tiako Department of Computer Science A/Mira University of Bejaiaa Algeria Applied Mathematics Laboratory A/Mira University of Bejaia Algeria Modeling and Optimization Systems Laboratory University of Bejaia Algeria CITDR Tiako University Oklahoma USA

Ubiquitous system returns to making pervasive computing in everyday life, the objects of our environments become intelligent and communicate without anyone being aware of their communication processes Ubiquitous computing adds the concept of mobility to the notion of omnipresence; therefore, it makes reference to moving intelligent objects (from mobile computing) that can communicate with other ubiquitous objects in our daily lives These advantages expose the network to malicious and unauthorized activities The security of these networks, targeted by attackers, is an important issue For this, Intrusion Detection Systems (IDSs) have been widely discussed for solving networks intrusions problems Several solutions have been adopted to overcome these kinds of intrusion These IDS solutions are insufficient and/or incomplete because they are based on centralized devises, and did not consider the heterogeneity and mobility nature of these devices, which is the case for ubiquitous environments We developed a new IDS approach to support security problems in ubiquitous network The approach proposed is based on nodes authentication abilities for preventing inside and outside ubiquitous network intrusion.

关键词： Ubiquitous computing Intrusion detection system (IDS) Security Trust

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A novell approach on evolutionary dynamics analysis - A progress report 1

A novell approach on evolutionary dynamics analysis - A prog...

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1st EAI International Conference on computer science and Engineering, COMPSE 2016

作者： Zelinka, Ivan Vasant, Pandian Dao, Tran Trong Hoang, Duy Vo Department of Computer Science VSB Technical University of Ostrava FEI Tr. 17. Listopadu 15 Ostrava Czech Republic Department of Fundamental and Applied Sciences Universiti Teknologi PETRONAS Seri Iskandar32610 Malaysia Modeling Evolutionary Algorithms Simulation and Artificial Intelligence Faculty of Electrical and Electronics Engineering Ton Duc Thang University Ho Chi Minh City Viet Nam

ISBN: (纸本)9781631901362

In this paper we discuss the possibility of novel mutual fusion of evolutionary algorithms, complex networks, strange dynamics and hidden attractors. As demonstrated in previous research papers, evolutionary algorithms are capable of very complex tasks such as chaotic system control, identification or synthesis and vice versa, chaos can be observed also in the evolutionary dynamics. We pro-pose a novel approach non how to analyze and control dynamic of evolutionary algorithm and also discuss possibility on strange dynamics analysis that is a part of dynamic of evolutionary algorithms. In any words, we propose to understand algorithms as a discrete dynamical system that exhibit wide spectra behavior that can be controlled and analyzed.

关键词： Evolutionary algorithms

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Numerical model of the nanoindentation test based on the digital material representation of the Ti/TiN multilayers

Numerical model of the nanoindentation test based on the dig...

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作者： Perzyński, Konrad Wiatr, Radoslaw Madej, Lukasz Department of Applied Computer Science and Modeling AGH University of Science and Technology 30 Mickiewicza Ave Cracow30-059 Poland

The developed numerical model of a local nanoindentation test, based on the digital material representation (DMR) concept, has been presented within the paper. First, an efficient algorithm describing the pulsed laser deposition (PLD) process was proposed to realistically recreate the specific morphology of a nanolayered material in an explicit manner. The nanolayered Ti/TiN composite was selected for the investigation. Details of the developed cellular automata model of the PLD process were presented and discussed. Then, the Ti/TiN DMR was incorporated into the finite element software and numerical model of the nanoindentation test was established. Finally, examples of obtained results presenting capabilities of the proposed approach were highlighted. © 2015 Wroclaw University of Technology.

关键词： Nanoindentation

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How software changes the world: The role of assumptions

How software changes the world: The role of assumptions

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International Conference on Research Challenges in Information science, RCIS

作者： Xiaowei Wang John Mylopoulos Giancarlo Guizzardi Nicola Guarino Department of Information Engineering and Computer Science University of Trento Italy Ontology and Conceptual Modeling Research Group Federal University of Espírito ISTC-CNR Laboratory for Applied Ontology Trento Italy Nicola Guarino ISTC-CNR Laboratory for Applied Ontology Trento Italy

ISBN: (纸本)9781479987115

The requirements for most software systems - the intended states-of-affairs these systems are supposed to bring about - concern their operational environment, often a socio-physical world. But software systems usually don't have any direct means to change that environment in order to bring about the intended states-of-affairs. In what sense then can we say that such systems fulfill their requirements? The main purpose of this paper is to account for this paradox. We do so by proposing a preliminary Ontology of Assumptions. This ontology aims to characterize and make explicit a number of notions that are used implicitly in software engineering practice to establish that a system specification S fulfills its requirements R given a set of assumptions A. Our proposal is illustrated with an example concerning a meeting scheduler.

关键词： Software systems Ontologies Calculus Software engineering Schedules computers

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Author Correction: The FLUXNET2015 dataset and the ONEFlux processing pipeline for eddy covariance data

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Scientific data 2021年第1期8卷 72页

作者： Gilberto Pastorello Carlo Trotta Eleonora Canfora Housen Chu Danielle Christianson You-Wei Cheah Cristina Poindexter Jiquan Chen Abdelrahman Elbashandy Marty Humphrey Peter Isaac Diego Polidori Markus Reichstein Alessio Ribeca Catharine van Ingen Nicolas Vuichard Leiming Zhang Brian Amiro Christof Ammann M Altaf Arain Jonas Ardö Timothy Arkebauer Stefan K Arndt Nicola Arriga Marc Aubinet Mika Aurela Dennis Baldocchi Alan Barr Eric Beamesderfer Luca Belelli Marchesini Onil Bergeron Jason Beringer Christian Bernhofer Daniel Berveiller Dave Billesbach Thomas Andrew Black Peter D Blanken Gil Bohrer Julia Boike Paul V Bolstad Damien Bonal Jean-Marc Bonnefond David R Bowling Rosvel Bracho Jason Brodeur Christian Brümmer Nina Buchmann Benoit Burban Sean P Burns Pauline Buysse Peter Cale Mauro Cavagna Pierre Cellier Shiping Chen Isaac Chini Torben R Christensen James Cleverly Alessio Collalti Claudia Consalvo Bruce D Cook David Cook Carole Coursolle Edoardo Cremonese Peter S Curtis Ettore D'Andrea Humberto da Rocha Xiaoqin Dai Kenneth J Davis Bruno De Cinti Agnes de Grandcourt Anne De Ligne Raimundo C De Oliveira Nicolas Delpierre Ankur R Desai Carlos Marcelo Di Bella Paul di Tommasi Han Dolman Francisco Domingo Gang Dong Sabina Dore Pierpaolo Duce Eric Dufrêne Allison Dunn Jiří Dušek Derek Eamus Uwe Eichelmann Hatim Abdalla M ElKhidir Werner Eugster Cacilia M Ewenz Brent Ewers Daniela Famulari Silvano Fares Iris Feigenwinter Andrew Feitz Rasmus Fensholt Gianluca Filippa Marc Fischer John Frank Marta Galvagno Mana Gharun Damiano Gianelle Bert Gielen Beniamino Gioli Anatoly Gitelson Ignacio Goded Mathias Goeckede Allen H Goldstein Christopher M Gough Michael L Goulden Alexander Graf Anne Griebel Carsten Gruening Thomas Grünwald Albin Hammerle Shijie Han Xingguo Han Birger Ulf Hansen Chad Hanson Juha Hatakka Yongtao He Markus Hehn Bernard Heinesch Nina Hinko-Najera Lukas Hörtnagl Lindsay Hutley Andreas Ibrom Hiroki Ikawa Marcin Jackowicz-Korczynski Dalibor Janouš Wilma Jans Rachhpal Jassal Shicheng Jiang Tomomichi Kato Myr Computational Research Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA. gzpastorello@lbl.gov. DIBAF University of Tuscia Viterbo 01100 Italy. Euro-Mediterranean Centre on Climate Change Foundation (CMCC) Lecce 73100 Italy. Climate & Ecosystem Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA. Computational Research Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA. Department of Civil Engineering California State University Sacramento CA 95819 USA. Department of Geography Environment and Spatial Sciences Michigan State University East Lansing MI 48823 USA. Department of Computer Science University of Virginia Charlottesville VA 22904 USA. TERN Ecosystem Processes Menzies Creek VIC3159 Australia. Max Planck Institute for Biogeochemistry Jena 07701 Germany. Laboratoire des Sciences du Climat et de l'Environnement (LSCE) CEA CNRS UVSQ UPSACLAY Gif sur Yvette 91190 France. Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China. Department of Soil Science University of Manitoba Winnipeg MB R3T2N2 Canada. Department of Agroecology and Environment Agroscope Research Institute Zürich 8046 Switzerland. School of Geography and Earth Sciences McMaster University L8S4K1 Hamilton ON Canada. Department of Physical Geography and Ecosystem Science Lund University Lund 22362 Sweden. Department of Agronomy and Horticulture University of Nebraska-Lincoln Lincoln NE 68583 USA. School of Ecosystem and Forest Sciences The University of Melbourne Richmond VIC3121 Australia. Department of Biology Research Group PLECO University of Antwerp Antwerp 2610 Belgium. Joint Research Centre European Commission Ispra 21027 Italy. TERRA Teaching and Research Center University of Liege Gembloux B-5030 Belgium. Finnish Meteorological Institute Helsinki 00560 Finland. ES

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An efficient intra block size decision for H.264/AVC encoding optimization

An efficient intra block size decision for H.264/AVC encodin...

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ACS/IEEE International Conference on computer Systems and Applications

作者： Abderrahmane Elyousfi Hamza Hamout Asma El Hachimi Department of Computer Science National Engineering School of Applied Sciences Ibn-Zohr University Agadir-Morocco Laboratory of Computer Systems and Vision Faculty of Sciences Ibn-Zohr University Agadir-Morocco Laboratory of Information Modeling and Communication Systems Faculty of Sciences Ibn-Tofail University Kenitra-Morocco

The video coding standard, H.264/MPEG-4 AVC, uses variable block sizes in intra coding. This feature has achieved significant coding gain compared to coding a macroblock (MB) using fixed block size. However, this feature results in extremely high computational complexity when brute force rate distortion optimization (RDO) algorithm is used. In this paper, we propose an Efficient Intra Block Size Decision for H.264/AVC Encoding Optimization. It makes use of the spatial homogeneity characteristics of the macroblock. Specifically, spatial homogeneity of a MB is decided based on the amplitude value of the proposed MB vector. Based on the homogeneity of the macroblock, only a small number of intra prediction modes are selected in the RDO process. Different video sequences are used to test the performance of proposed method. Experimental results reveal the significant computational savings achieved with slight Peak Signal-to-Noise Ratio (PSNR) degradation and bit-rate increase.

关键词： Encoding Video coding Prediction algorithms Complexity theory Signal processing algorithms Standards Software algorithms

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Intelligent model for measuring learners' satisfaction towards new contents 15

Intelligent model for measuring learners' satisfaction towar...

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15th International Conference on Information Technology Based Higher Education and Training, ITHET 2016

作者： Elghibari, Fatiha Elouahbi, Rachid El Khoukhi, Fatima Ezzahri, Layla Macs, Labo Amali, Said Department of Mathematics and Computer Science Moulay Ismail University Faculty of Sciences Meknes Morocco Team Modeling Applied Informatics in Humanities MIASH Moulay Ismail University Faculty of Humanities Meknes Morocco Team Théorie des Systèmes et Informatique TSI Moulay Ismail University Faculty of Sciences Meknes Morocco Team Outils Mathématiques en Economie Gestion et Actuariat OMEGA Moulay Ismail University Faculty of Juridical Economic and Social Sciences Meknes Morocco

ISBN: (纸本)9781509007783

Learner satisfaction is an important factor for a successful e-Learning. It allows learners to continue learning and provide their conveniences to facilitate the knowledge. That is why, the main purpose of this study is to enhance learning services in online environments, in order to keep learners' motivation and track their cognition' evolution. Namely, identify their satisfaction toward new inserted contents. In this paper, we present a learning model that detects satisfaction' degree of learners at two levels;during and after completing the course. During learning by using satisfaction agent (SA) that collects data and calculates satisfaction level towards each content' unit. This process allows to integrate improvement if we have a low levels of satisfaction. And after completing course in order to evaluate the evolution of learners' knowledge, and test the effectiveness of the methods and tools used in. © 2016 IEEE.

关键词： Motivation

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