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Self-assembly of skyrmion-dressed chiral nematic colloids with tangential anchoring

Physical Review E 2014年第6期89卷 060502(R)-060502(R)页

作者： M. B. Pandey T. Porenta J. Brewer A. Burkart S. Čopar S. Žumer Ivan I. Smalyukh Department of Physics and Liquid Crystal Materials Research Center University of Colorado Boulder Colorado 80309 USA Department of Physics VSSD College Kanpur 208 002 India Faculty of Mathematics and Physics University of Ljubljana Jadranska 19 1000 Ljubljana Slovenia Jozef Stefan Institute Jamova 39 1000 Ljubljana Slovenia Department of Electrical Computer and Energy Engineering and Materials Science and Engineering Program University of Colorado Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA

We describe dipolar nematic colloids comprising mutually bound solid microspheres, three-dimensional skyrmions, and point defects in a molecular alignment field of chiral nematic liquid crystals. Nonlinear optical imaging and numerical modeling based on minimization of Landau–de Gennes free energy reveal that the particle-induced skyrmions resemble torons and hopfions, while matching surface boundary conditions at the interfaces of liquid crystal and colloidal spheres. Laser tweezers and videomicroscopy reveal that the skyrmion-colloidal hybrids exhibit purely repulsive elastic pair interactions in the case of parallel dipoles and an unexpected reversal of interaction forces from repulsive to attractive as the center-to-center distance decreases for antiparallel dipoles. The ensuing elastic self-assembly gives rise to colloidal chains of antiparallel dipoles with particles entangled by skyrmions.

关键词： SKYRMIONS RESEARCH LIQUID crystals MOLECULAR self-assembly PARTICLES QUANTUM entanglement

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Towards new user interfaces based on gesture and sound identification 2

Towards new user interfaces based on gesture and sound ident...

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2nd Workshop on Software Quality Analysis, Monitoring, Improvement, and Applications, SQAMIA 2013

作者： Košič, Kristjan Arzenšek, Boštjan Kuhar, Saša Vogrinčič, Matej Institute of Informatics Faculty of Electrical Engineering and Computer Science University of Maribor Smetanova ulica 17 Maribor2000 Slovenia University Medical Center Maribor Ljubljanska ulica 5 Maribor2000 Slovenia

The relatively low price of devices that enable capture of 3D data such as Microsoft Kinect will certainly accelerate the development and popularization of a new generation of user interaction in the business application domain. Although the application interfaces and libraries that make it easier to communicate with these devices continue to be in the process of developing and maturing, they can still be used for the development of business solutions. In addition, gestures and sounds provide more natural and effective ways of human-computer interaction. In this paper we present an overview and a basic comparison of the available sensing devices together with the experience gained during the development of solution ADORA, which main purpose is to assist surgeons with the help of contactless interaction. Copyright © by the paper's authors. Copying permitted only for private and academic purposes.

关键词： User interfaces

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Evolutionary synthesis of control rules by means of analytic programming for the purpose of high order oscillations stabilization of evolutionary synthesized chaotic system

Evolutionary synthesis of control rules by means of analytic...

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Conference on Modern Methods of Prediction, Modeling and Analysis of Nonlinear Systems, Nostradamus 2012

作者： Senkerik, Roman Oplatkova, Zuzana Zelinka, Ivan Tomas Bata University in Zlin Faculty of Applied Informatics T.G. Masaryka 5555 760 01 Zlin Czech Republic VŠB-Technical University of Ostrava Faculty of Electrical Engineering and Computer Science Department of Computer Science 17. listopadu 15 708 33 Ostrava-Poruba Czech Republic

ISBN: (纸本)9783642332265

In this paper, it is presented a utilization of tool for symbolic regression, which is analytic programming, for the purpose of the synthesis of a new control law. This synthesized chaotic controller secures the stabilization of high periodic orbit - oscillations between several values of selected one-dimensional discrete chaotic system, which is artificially evolutionary synthesized system. The paper consists of the descriptions of analytic programming as well as chaotic system, used evolutionary techniques and the cost function. For experimentation, Self-Organizing Migrating Algorithm (SOMA) and Differential evolution (DE) were used. © 2013 Springer-Verlag.

关键词： Chaotic systems

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An exploratory study on content-based filtering of call for papers

An exploratory study on content-based filtering of call for ...

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6th Information Retrieval Facility Conference for science and Technology, IRFC 2013

作者： Hurtado Martín, Germán Schockaert, Steven Cornelis, Chris Naessens, Helga Faculty of Applied Engineering Sciences University College Ghent Ghent Belgium Dept. of Applied Math. Comp. Science and Statistics Ghent University Belgium School of Computer Science and Informatics Cardiff University United Kingdom Dept. of Computer Science and Artificial Intelligence University of Granada Spain

ISBN: (纸本)9783642410567

Due to the increasing number of conferences, researchers need to spend more and more time browsing through the respective calls for papers (CFPs) to identify those conferences which might be of interest to them. In this paper we study several content-based techniques to filter CFPs retrieved from the web. To this end, we explore how to exploit the information available in a typical CFP: a short introductory text, topics in the scope of the conference, and the names of the people in the program committee. While the introductory text and the topics can be directly used to model the document (e.g. to derive a tf-idf weighted vector), the names of the members of the program committee can be used in several indirect ways. One strategy we pursue in particular is to take into account the papers that these people have recently written. Along similar lines, to find out the research interests of the users, and thus to decide which CFPs to select, we look at the abstracts of the papers that they have recently written. We compare and contrast a number of approaches based on the vector space model and on generative language models. © 2013 Springer-Verlag.

关键词： Information retrieval

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Efficient algorithms for a simple network design problem

Efficient algorithms for a simple network design problem

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作者： Nakano, Shin-Ichi Uehara, Ryuhei Uno, Takeaki Department of Computer Science Faculty of Engineering Gumma University Gumma 376-8515 Japan School of Information Science Japan Advanced Institute of Science and Technology Ishikawa 923-1292 Japan National Institute of Informatics Chiyoda-ku Tokyo 101-8430 Japan

We consider the following simple network design problem. The input consists of n weighted nodes, and the output is an edge-weighted connected network such that the total weight of the edges incident to a node is at least the given weight of the node. We aim to design the cheapest connected network;that is, the reachability of the network should be guaranteed, and the network is better if its total weight is less. In this article, we first show an efficient algorithm that produces an optimal network with minimum weight. The algorithm runs in linear time, and the resulting network contains at most n edges, where n is the number of nodes. To construct a connected network, at least n - 1 edges are required. However, the algorithm sometimes outputs n edges. Next, we aim to minimize not only the weight but also the number of edges. That is, for given n weighted nodes, we aim to design a cheapest tree. Then, the problem becomesNP-complete. We also propose efficient approximation algorithms for constructing a cheapest tree. Copyright © 2013 Wiley Periodicals, Inc.

关键词： Approximation algorithms

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Geospatial data extrapolation using data mining techniques and cellular automata

Geospatial data extrapolation using data mining techniques a...

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International Conference on Advanced computer science and Information System (ICACSIS)

作者： Ahmad Zuhdi Aniati Murni Heru Suhartanto Informatics Engineering Department of Faculty of Industrial Technology Trisakti University Faculty of Computer Science University of Indonesia

This paper describes a geospatial knowledge discovery model of historical maps data set with relative geographic referenced. The knowledge about spatiotemporal dynamic is represented by the transition rules of cellular automata model. Set of transition rules obtained by applying three data mining techniques on large amount of data grid. First, multiple linear regression analysis applied on each subsequent pair of N data grid to obtained (N-1) rules. Second, by applying clustering analysis, then they extracted into a small number of rules, which is represented all of the rules, and they associated with the first data grid of the related pair. Finally, the selected rules used in determining the next value of the given data using classification analysis. Selection of the rule applied to the data based on the distance between the data and the associated data grid of the selected rule. The model had been evaluated on ordinal data type from fire danger rating and nominal data from land use and land cover status. Model accuration measured and visualized by comparing actual data and the simulated data. The accuration ranges between 80%-95% in the first case and 90,5%-95,2% in the second. In the first case, by the segmentation of the model, the performance can be improved significantly, especially for von Neumann scheme.

关键词： Data models Analytical models Spatiotemporal phenomena Computational modeling Fires Geospatial analysis Data mining

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A pattern based two-stage text classifier

A pattern based two-stage text classifier

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9th International Conference on International Conference on Machine Learning and Data Mining, MLDM 2013

作者： Bijaksana, Moch Arif Li, Yuefeng Algarni, Abdulmohsen School of Electrical Engineering and Computer Science Queensland University of Technology Brisbane QLD 4000 Australia Informatics Faculty Telkom Institute of Technology Bandung 40257 Indonesia College of Computer Science King Khalid University P.O. Box 394 Abha 61411 Saudi Arabia

ISBN: (纸本)9783642397110

In a classification problem typically we face two challenging issues, the diverse characteristic of negative documents and sometimes a lot of negative documents that are closed to positive documents. Therefore, it is hard for a single classifier to clearly classify incoming documents into classes. This paper proposes a novel gradual problem solving to create a two-stage classifier. The first stage identifies reliable negatives (negative documents with weak positive characteristics). It concentrates on minimizing the number of false negative documents (recall-oriented). We use Rocchio, an existing recall based classifier, for this stage. The second stage is a precision-oriented "fine tuning", concentrates on minimizing the number of false positive documents by applying pattern (a statistical phrase) mining techniques. In this stage a pattern-based scoring is followed by threshold setting (thresholding). Experiment shows that our statistical phrase based two-stage classifier is promising. © 2013 Springer-Verlag.

关键词： Classification (of information)

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Traffic signal control optimization using genetic algorithm and signaling model modification 20

Traffic signal control optimization using genetic algorithm ...

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20th Intelligent Transport Systems World Congress, ITS 2013

作者： Wijaya, I. Gede Pasek Suta Uchimura, Keiichi Koutaki, Gou Nishihara, Toshiki Informatics Engineering and Electrical Engineering Dept. Faculty of Engineering Mataram Univ. Jl. Majapahit 62 Mataram Indonesia Computer Science and Electrical Enginnering Kumamoto University Kurokami 2-39-1 Kumamoto Shi860-8555 Japan

This paper proposes a traffic signal control optimization using not only Multi-Element Genetics Algorithms (ME-GA) but also modification of signaling model. The aim of this method is to find out the best signaling model for considered network with the ME-GA for defining the optimum signal parameter. In this case, three signaling models are proposed for the considered road networks. Several experiments were carried out using simple network model and real network model (Ooe-Toroku Kumamoto City Road Network) for evaluating the proposed method. The experimental results show that the first signaling model with ME-GA provides the best performance which is shown by higher percentage of vehicle flow and less vehicle delay time than others signaling models for considered networks.

关键词： Genetic algorithms

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Parallel implementation of the Ant Colony System algorithm for automated combinational logic circuits design using CUDA architecture

Parallel implementation of the Ant Colony System algorithm f...

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Proceedings of the International Convention MIPRO

作者： Džanan Bajgorić Adnan Porović Tarik Handanović Novica Nosović Faculty of Electrical Engineering Department for Computer Science and Informatics University of Sarajevo Bosnia and Herzegovina

This paper propose parallel implementation of Ant Colony System (ACS) algorithm for automated combinational circuit design. Ant Colony System is one of the most popular and widely used Ant Colony Optimization (ACO) algorithm and heuristic algorithm in general. As digital logic circuits become more complex, efficient circuit design is priority and use of heuristic methods are unavoidable. Unfortunately, the optimization problems became so complex in sense of their size, even the most powerful heuristic algorithms can't solve them on single CPU. In order to be able to tackle the problem, parallel version of ACS is needed and this paper presents CUDA (Compute Unified Device Architecture) C language implementation.

关键词： Logic gates Algorithm design and analysis Graphics processing units computer architecture Digital circuits Heuristic algorithms Combinational circuits

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Designing and evaluating collaborative learning scenarios in moodle LMS courses

Designing and evaluating collaborative learning scenarios in...

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10th International Conference on Cooperative Design, Visualization, and engineering, CDVE 2013

作者： Echeverria, Leovy Cobos, Ruth Morales, Mario Faculty of Informatics Engineering Universidad Pontificia Bolivariana Montería Colombia Department of Computer Science Universidad Autónoma de Madrid Spain Department of Mathematics and Statistics Universidad de Córdoba Montería Colombia

ISBN: (纸本)9783642408397

The main purpose of this paper is to present a service called Teaching Assistant. The aim of the assistant is to facilitate the task and assessment management in collaborative learning scenarios. This assistant intends to help instructors to design and to evaluate collaborative learning tasks in this type of scenarios. For the development of the Teaching Assistant we defined an instructional model based on the Group Investigation method. The implementation of the assistant is embedded into the Learning Management System Moodle. Nowadays, a research study has been performing with students and instructors at the Universidad Pontificia Bolivariana, UPB-Montería (Colombia). The objective of the study is to identify the effect of the Teaching Assistant in the design process of the collaborative learning scenarios scripted by the instructors in Moodle. Specifically, how the assistant decreases the time used in this process. Due to this improvement, the learning experiences can be better. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： E-learning

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