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Proceedings of the 19th International Conference on Neural Information Processing Systems

作者： Uri Maoz Elon Portugaly Tamar Flash Yair Weiss Interdisciplinary Center for Neural Computation The Hebrew Univ. of Jerusalem Jerusalem Israel and Dept. of Computer Science and Applied Mathematics The Weizmann Inst. of Science Rehovot Israel and School of Comp. Science and Eng. The Hebrew Univ. of Jerusalem Jerusalem Israel School of Computer Science and Engineering The Hebrew University of Jerusalem Jerusalem Israel 2 Department of Computer Science and Applied Mathematics The Weizmann Institute of Science Rehovot Israel Interdisciplinary Center for Neural Computation The Hebrew University of Jerusalem Jerusalem Israel and School of Computer Science and Engineering The Hebrew University of Jerusalem Jerusalem Israel

The two-thirds power law, an empirical law stating an inverse non-linear relationship between the tangential hand speed and the curvature of its trajectory during curved motion, is widely acknowledged to be an invariant of upper-limb movement. It has also been shown to exist in eye-motion, locomotion and was even demonstrated in motion perception and prediction. This ubiquity has fostered various attempts to uncover the origins of this empirical relationship. In these it was generally attributed either to smoothness in hand- or joint-space or to the result of mechanisms that damp noise inherent in the motor system to produce the smooth trajectories evident in healthy human *** show here that white Gaussian noise also obeys this power-law. Analysis of signal and noise combinations shows that trajectories that were synthetically created not to comply with the power-law are transformed to power-law compliant ones after combination with low levels of noise. Furthermore, there exist colored noise types that drive non-power-law trajectories to power-law compliance and are not affected by smoothing. These results suggest caution when running experiments aimed at verifying the power-law or assuming its underlying existence without proper analysis of the noise. Our results could also suggest that the power-law might be derived not from smoothness or smoothness-inducing mechanisms operating on the noise inherent in our motor system but rather from the correlated noise which is inherent in this motor system.

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API usability: CHI'2009 special interest group meeting

API usability: CHI'2009 special interest group meeting

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27th International Conference Extended Abstracts on Human Factors in Computing Systems, CHI 2009

作者： Daughtry, John M. Farooq, Umer Stylos, Jeffrey Myers, Brad A. Applied Research Laboratory College of Info. Sci. and Tech. Pennsylvania State Univ. University Park PA 16802 United States Microsoft Corporation One Microsoft Way Redmond WA 98052 United States Computer Science Department Carnegie Mellon University 5000 Forbes Ave. Pittsburgh PA 15213 United States Human Computer Interaction Inst. School of Computer Science Carnegie Mellon University Pittsburgh PA 15213-3891 United States

ISBN: (纸本)9781605582474

Programmers of all types from novice end-user developers to professional software engineers make use of application programming interfaces (API) within their various designs. And, while the use of these interfaces is ubiquitous, there is little research about their design. Recently, a number of researchers and practitioners have begun to treat API design as a first-order object of study and practice. The purpose of this special interest group meeting is to bring together the community of usability researchers and professionals interested in API usability. The time will be used to discuss attendees' ideas and opinions in order to stimulate this new and exciting emerging field that crosses the boundaries between human-computer interaction and software engineering.

关键词： Human computer interaction

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Aliens on the Bus: A family of pervasive games

Aliens on the Bus: A family of pervasive games

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2013 IEEE 2nd Global Conference on Consumer Electronics, GCCE 2013

作者： Jantke, Klaus P. Arnold, Oksana Spundflasch, Sebastian Fraunhofer Inst. Digital Media Technology Children's Media Department Erich-Kästner-Straße 1a 99094 Erfurt Germany Erfurt Univ. of Applied Sciences Applied Computer Science Altonaer Straße 25 99085 Erfurt Germany Ilmenau University of Technology Institute of Media Technology P.O. Box 100565 98684 Ilmenau Germany

ISBN: (纸本)9781479908929

There is an interesting category of digital games particularly challenging consumer electronics: pervasive games. On the one hand, pervasive games appear extremely promising for purposes such as learning and for encouraging players to engage in healthy outdoor activities. They widen the horizon of games content by direct access to reality. On the other hand, a larger number of pervasive games failed badly bearing abundant evidence for the need of better understanding the essentials of pervasive games and of the experience in playing them. The authors have developed not only a single pervasive game concept, but a whole family of concepts quite suitable for systematically challenging consumer electronics aiming at a wide spectrum of effects ranging from amusement to game-based learning. © 2013 IEEE.

关键词： Human computer interaction

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Energy efficient multicast routing in ad hoc wireless networks with discrete levels of transmission power

Energy efficient multicast routing in ad hoc wireless networ...

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International Conference on Communications, Circuits and Systems (ICCCAS)

作者： H.-W. Du Xiaohua Jia X.-D. Hu Department of Computer Science City University of Hong Kong Kowloon Hong Kong China Inst of Applied Mathematics Chinese Academy and Sciences Beijing China

In this paper, we discuss the energy efficient multicast problem in ad hoc wireless networks. We assume that each node in the network has a set of discrete levels of transmission power and nodes are relatively static. The problem is, given a set of nodes in the Euclidean plane and a multicast request, to construct a multicast tree rooted at the source and including all destinations such that the total energy cost of the transmitting nodes in the tree is minimized. We first prove that this problem is NP-hard and is unlikely to have an approximation algorithm with a logarithmic performance ratio. We then propose two algorithms, one is based on the Steiner tree method and the other is based on connected dominating set method. Both algorithms have guaranteed performance ratios and outperform the existing method.

关键词： Energy efficiency Routing Intelligent networks Wireless networks Costs Approximation algorithms Multicast algorithms Mobile ad hoc networks Mobile communication Ad hoc networks

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ExplorerTree: A focus+context exploration approach for 2D embeddings

arXiv

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arXiv 2021年

作者： Marcílio, Wilson E. Eler, Danilo M. Paulovich, Fernando V. Rodrigues, José F. Artero, Almir O. Dept. of Mathematics and Computer Science São Paulo State University Presidente SP Presidente Prudente Brazil Faculty of Computer Science Dalhousie University HalifaxNS Canada Inst. of Mathematics and Computer Sciences University of São Paulo SP São Carlos Brazil

In exploratory tasks involving high-dimensional datasets, dimensionality reduction (DR) techniques help analysts to discover patterns and other useful information. Although scatter plot representations of DR results allow for cluster identification and similarity analysis, such a visual metaphor presents problems when the number of inst.nces of the dataset increases, resulting in cluttered visualizations. In this work, we propose a scatter plot-based multilevel approach to display DR results and address clutter-related problems when visualizing large datasets, together with the definition of a methodology to use focus+context interaction on non-hierarchical embeddings. The proposed technique, called ExplorerTree, uses a sampling selection technique on scatter plots to reduce visual clutter and guide users through exploratory tasks. We demonstrate ExplorerTree's effectiveness through a use case, where we visually explore activation images of the convolutional layers of a neural network. Finally, we also conducted a user experiment to evaluate ExplorerTree's ability to convey embedding structures using different sampling strategies. © 2021, CC BY.

关键词： Visualization

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Enterprise, Business-Process and Information Systems Modeling 1

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丛书名： Lecture Notes in Business Information Processing

1000年

作者： Rainer Schmidt Wided Guédria Ilia Bider Sérgio Guerreiro

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Geometrically aware communication in random wireless networks 04

Geometrically aware communication in random wireless network...

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Proceedings of the 23rd Annual ACM Symposium on Principles of Distributed Computing

作者： Kozma, Gady Lotker, Zvi Sharir, Micha Stupp, Gideon Faculty of Mathematics Weizmann Institute of Science Rehovot 76100 Israel Project Mascotte INRIA Sophia Antipolis 06902 France School of Computer Science Tel Aviv University Tel-Aviv 69978 Israel Courant Inst. of Math. Sciences New York University New York NY 10012 United States Electrical Engineering Dept Technion Haifa 32000 Israel

ISBN: (纸本)9781581138023

Some of the first routing algorithms for position-aware wireless networks used the Delaunay triangulation of the point-locations of the network's nodes as the underlying connectivity graph. Later on these solutions were considered impractical because the Delaunay triangulation may in general contain arbitrarily long edges and because calculating the Delaunay triangulation may require a global view of the network. Many other algorithms were then suggested for geometric routing, often assuming random placement of network nodes for analysis or simulation [27, 5, 28, 15]. But as we show, when the nodes are uniformly placed in the unit disk the Delaunay triangulation does not contain long edges, it is easy to compute locally and it is in many ways optimal for geometric routing and flooding. In particular, we prove that with high probability the maximal length of an edge in Del(P), the Delaunay triangulation of a set P of n nodes uniformly placed in the unit disk, is O (3√log n/n), and that the expected sum of squares of all the edges in Del(P) is O(1). These geometric results imply that for wireless networks, randomly distributed in a unit disk (1) computing the Delaunay triangulation locally is asymptotically easy;(2) simple "face routing" through the Delaunay triangulation optimizes, up to poly-logarithmic factors, the energy load on the nodes, and (3) flooding the network, an operation quite common in sensor nets, is with high probability optimal up to a constant factor. The last property is particularly important for geocasting because the Delaunay triangulation is known to be a spanner.

关键词： Telecommunication networks

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Optimal sampling functions in nonuniform sampling driver designs to overcome the Nyquist limit

Optimal sampling functions in nonuniform sampling driver des...

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IEEE International Conference on Multimedia and Expo (ICME)

作者： F. Papanfub Y. Artyukh E. Boole D. Timmermann Inst. of Appl. Microelectronics & Comput. Sci. Rostock Univ. Germany Institute of Electronics and Computer Science (IECS) Riga Latvia Institute of Applied Microelectronics and Computer Science University of Rostock Germany

In some applications the observed samples are inherently nonuniform. In contrast to that in this paper we take advantage of deliberate nonuniform sampling and perform DSP where the classical approaches leave off. For inst.nce think about mobile communication or digital radio. Deliberate nonuniform sampling promises increased equivalent sampling rates with reduced overall hardware costs. The equivalent sampling rate is the sampling rate that a uniform sampling device would require in order to achieve the same processing bandwidth. While the equivalent bandwidth of a realizable system may well extend into the GHz range its mean sampling rate is usually in the MHz range. Current existing prototype systems achieve 40 times the bandwidth of a classic DSP system that would operate uniformly (cf. [Y. Artyukh, et al., Evaluation of Pseudorandom Sampling Process, 1997] and [Y. Artyukh, et al., virtual Oscilloscope of the DASP-Lab System 1997]). Throughout the literature on nonuniform sampling (e. g. [I. Bilinskis and A. Mikelsons, 1992], [F. Marvasti, 2001] and [J.J. Wojtiuk, 2000]) many sampling schemes have been investigated. In this paper the authors discuss a nonuniform sampling scheme that is especially suited to be implemented in digital devices, thus, fully exploiting state-of-the-art ADCs without violating their specifications. An analysis of the statistical properties of the algorithm is given to demonstrate common pitfalls and to prove its correctness.

关键词： Sampling methods Nonuniform sampling Bandwidth Digital signal processing Mobile communication Digital communication Hardware Costs Prototypes Oscilloscopes

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Question Answering Systems: Survey and Trends

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Procedia computer science 2015年 73卷 366-375页

作者： Abdelghani Bouziane Djelloul Bouchiha Noureddine Doumi Mimoun Malki Ctr Univ Naama Inst. Sciences and Technologies Department Mathematics and Computer Science Algeria University Dr. Tahar Moulay of Saida EEDIS Laboratory Djillali Liabes University of Sidi Bel Abbes Algeria

The need to query information content available in various formats including structured and unstructured data (text in natural language, semi-structured Web documents, structured RDF data in the semantic Web, etc.) has become increasingly important. Thus, Question Answering Systems (QAS) are essential to satisfy this need. QAS aim at satisfying users who are looking to answer a specific question in natural language. In this paper we survey various QAS. We give also statistics and analysis. This can clear the way and help researchers to choose the appropriate solution to their issue. They can see the insufficiency, so that they can propose new systems for complex queries. They can also adapt or reuse QAS techniques for specific research issues.

关键词： Question Answering System (QAS) Natural Language Processing (NLP) Information Retrieval SPARQL Semantic Web

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Disturbance Decoupling of Switched Linear Systems

Disturbance Decoupling of Switched Linear Systems

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2010 49th IEEE Conference on Decision and Control

作者： E. Yurtseven W.P.M.H. Heemels M.K. Camlibel Eindhoven University of Technology Dept. of Mechanical Engineering Hybrid and Networked Systems group The Netherlands University of Groningen Inst. of Mathematics and Computer Science Groningen The Netherlands

ISBN: (纸本)9781424477456

In this paper we consider disturbance decoupling problems for switched linear systems. We will provide necessary and sufficient conditions for three different versions of disturbance decoupling, which differ based on which signals are considered to be the disturbance. In the first version the continuous exogenous input is considered as the disturbance, in the second the switching signal and in the third both of them are considered as disturbances. The solutions of the three disturbance decoupling problems will be based on geometric control theory for switched linear systems and will entail both mode-dependent and mode-independent static state feedback.

关键词： Disturbance decoupling switched linear systems invariant subspaces geometric control theory

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