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NetVisia: Heat Map & Matrix Visualization of Dynamic Social Network Statistics & Content

NetVisia: Heat Map & Matrix Visualization of Dynamic Social ...

引用

IEEE International Conference on and IEEE International Confernece on Social Computing (SocialCom) Privacy, Security, Risk and Trust (PASSAT)

作者： Robert Gove Nick Gramsky Rose Kirby Emre Sefer Awalin Sopan Cody Dunne Ben Shneiderman Meirav Taieb-Maimon University of Maryland at College Park College Park MD US Department of Computer Science University of Maryland College Park MD USA Ben-Gurion University of the Negev Beersheva Israel Human-Computer Interaction Laboratory University of Maryland College Park MD USA

Visualizations of static networks in the form of node-link diagrams have evolved rapidly, though researchers are still grappling with how best to show evolution of nodes over time in these diagrams. This paper introduces NetVisia, a social network visualization system designed to support users in exploring temporal evolution in networks by using heat maps to display node attribute changes over time. NetVisia's novel contributions to network visualizations are to (1) cluster nodes in the heat map by similar metric values instead of by topological similarity, and (2) align nodes in the heat map by events. We compare NetVisia to existing systems and describe a formative user evaluation of a NetVisia prototype with four participants that emphasized the need for tool tips and coordinated views. Despite the presence of some usability issues, in 30-40 minutes the user evaluation participants discovered new insights about the data set which had not been discovered using other systems. We discuss implemented improvements to NetVisia, and analyze a co-occurrence network of 228 business intelligence concepts and entities. This analysis confirms the utility of a clustered heat map to discover outlier nodes and time periods.

关键词： Heating Measurement Social network services Layout Training Image color analysis Usability

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A Hierarchical Unification of LIRICS and VerbNet Semantic Roles

A Hierarchical Unification of LIRICS and VerbNet Semantic Ro...

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International Conference on Semantic Computing

作者： Claire Bonial William Corvey Martha Palmer Volha V. Petukhova Harry Bunt Department of Linguistics University of Colorado Boulder USA Human Speech and Language Technologies Vicomtech-IK4-Visual Interaction Communication Technologies USA Department of Computer Science Tilburg University Netherlands

This research compares several of the thematic roles of Verb Net (VN) to those of the Linguistic Infrastructure for Interoperable Resources and Systems (LIRICS). The purpose of this comparison is to develop a standard set of thematic roles that would be suited to a variety of natural language processing (NLP) applications. We draw from both resources to construct a unified set of semantic roles that will replace existing VN semantic roles. Through the process of comparison, we find that a hierarchical organization of coarse-grained, intermediate and fine-grained roles facilitates mapping between semantic resources of differing granularity and allows for flexibility in how VN can be used for diverse NLP applications, thus, we propose a hierarchical taxonomy of the unified role set. The comparison and subsequent development of the hierarchy reveals a level of granularity shared by both resources, which could be further developed into a standard set of thematic roles for the International Organization for Standardization (ISO).

关键词： Semantics Syntactics ISO standards Concrete Pragmatics Labeling Organizations

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Music genre/mood classification using a feature-based modulation spectrum

Music genre/mood classification using a feature-based modula...

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International Conference on Mobile IT Convergence (ICMIC)

作者： Shin-Cheol Lim Sei-Jin Jang Soek-Pil Lee Moo Young Kim Human Computer Interaction Laboratory Department Information Communication Engineering Sejong University Seoul South Korea Digital Media Research Center Korea Electronics Technology Institute Seoul South Korea

The feature-based modulation flatness measure (FMSFM) and feature-based modulation crest measure (FMSCM) are proposed as novel feature vectors for music genre and mood classification. These features are extracted using a feature-based modulation spectrum to represent time-varying characteristics of the music signal. Instead of the spectrogram of the signal, timbral features such as mel-frequency cepstral coefficient (MFCC), decorrelated filter bank (DFB), and octave-based spectral contrast (OSC) are used for modulation. Combining FMSFM and FMSCM with the timbral features, we obtain significantly better accuracy in genre and mood classification than the conventional features.

关键词： Mood Feature extraction Support vector machine classification Accuracy Mel frequency cepstral coefficient Frequency modulation

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Optical-Flow Perspective Invariant Registration

Optical-Flow Perspective Invariant Registration

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Proceedings of the Digital Image Computing: Technqiues and Applications (DICTA)

作者： Adrian Clark Richard Green Human Interface Technology Laboratory University of Canterbury Christchurch New Zealand Department of Computer Science University of Canterbury Christchurch New Zealand

In this paper we examine the causes of one of the major shortcomings of current natural feature registration approaches, failure to register when the camera's view approaches parallel to the marker. The methods used by current registration algorithms in the attempt to overcome this problem are reviewed, and a novel tracking based approach called the Optical-flow Perspective Invariant Registration Augmentation (OPIRA) is presented which significantly improves the range of registration. A thorough evaluation of OPIRA is conducted using an external ground truth, showing the improvements possible when combined with leading natural feature registration algorithms such as SIFT, SURF and Ferns.

关键词： Adaptive optics Cameras Feature extraction computer vision Optical imaging Accuracy Robustness

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The value chain for web accessibility: Challenges and opportunities

The value chain for web accessibility: Challenges and opport...

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Workshop on Accessible Design in the Digital World 2011, ADDW 2011

作者： Petrie, Helen Power, Christopher Swallow, David Velasco, Carlos A. Gallagher, Blaithin Magennis, Mark Murphy, Emma Collin, Sam Down, Keren Human Computer Interaction Research Group Department of Computer Science University of York Deramore Lane York YO10 5GH United Kingdom Schloss Birlinghoven D53757 Sankt Augustin Germany National Council for the Blind of Ireland Whitworth Rd. Drumcondra Dublin 9 Ireland Foundation for Assistive Technology 302 Tower Bridge Business Centre 46-48 East Smithfield London E1W 1AW United Kingdom

This paper presents the results of interviews with representatives of the three key groups of stakeholders in the value chain for web accessibility: website commissioners, web developers and web accessibility experts. 26 web commissioners, 7 web developers and 14 web accessibility experts were interviewed. The results show that in spite of great efforts by the World Wide Web Consortium, the European Commission and other international and national organizations to promote web accessibility, knowledge of this topic is still low. More critically, the tools to support commissioners, developers and accessibility experts are still very poor and do not provide much of the functionality that the various groups in the value chain need. We believe these results highlight some of the reasons why the state of web accessibility is still as poor as it is.

关键词： Websites

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A distributed control architecture for sensor based motion control of autonomous wheeled mobile robots

A distributed control architecture for sensor based motion c...

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World Congress on Intelligent Control and Automation (WCICA)

作者： Bin Ge Gen'ichi Yasuda Information Processing Laboratory Dalian University Dalian Liaoning China Department of Human and Computer Intelligence Nagasaki Institute of Applied Science Nagasaki Japan

This paper presents an experimental study on environment recognition and movement control for multi-agent robotic soccer using wheeled mobile robots. A color image segmentation method based on YUV color information of each pixel of the color image is applied to the object recognition. The color image segmentation is performed using the tables that transform each value in a pixel to membership in several color classes, where the lower and higher threshold values of Y, U, and V are determined and described for the sample color markers. The position of objects on the field is efficiently and accurately calculated using a monocular camera. A common image processing method is used to detect landmarks such as corners/edges in the environment. A movement control algorithm is implemented based on the distance and orientation to the target. Experimental results of real-time movement control are also presented.

关键词： Mobile robots Color Image segmentation computer architecture Image color analysis Object recognition

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Gazing and Frowning to computers Can Be Enjoyable

Gazing and Frowning to Computers Can Be Enjoyable

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International Conference on Knowledge and Systems Engineering (KSE)

作者： Outi Tuisku Veikko Surakka Yulia Gizatdinova Toni Vanhala Ville Rantanen Jarmo Verho Jukka Lekkala Tampere Unit for Computer-Human Interaction (TAUCHI) University of Tampere Tampere Finland VTT Technical Research Centre of Finland Tampere Finland Department of Automation Science and Engineering Tampere University of Technology Tampere Finland

The present aim is to introduce first results of a new wearable prototype called Face Interface. The prototype was developed to carry both a video-based wearable eye tracker for pointing and a capacitive facial movement detector for selecting objects on a computer screen. The functionality of the prototype was evaluated in a controlled laboratory conditions in pointing and selecting tasks with three target diameters and three pointing distances. Also subjective ratings about the use of the device in interaction were collected. Participants achieved a mean pointing task time of 2.5 seconds with the prototype. This was improved to 1.2 seconds on average when the wearable eye tracker of the prototype was substituted by a commercial desktop eye tracker. The results revealed that target selection using the Face Interface prototype followed the Fitts' law with correlation of r = 0.76. The participants rated the use of the prototype as enjoyable, fast and accurate.

关键词： Prototypes computers Tracking Electromyography Facial muscles Mice

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Ready-set-transfer! Technology transfer in the requirements engineering domain

Ready-set-transfer! Technology transfer in the requirements ...

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IEEE International Conference on Requirements Engineering

作者： Jane Cleland-Huang Daniela Damian Center of Excellence for Software Traceability (CoEST) School of Computing DePaul University Chicago IL USA Software Engineering Global interAction Laboratory (SEGAL) Department of Computer Science University of Victoria BC Canada

The primary goal of requirements engineering research is to propose, develop, and validate effective solutions for important practical problems. However practice has shown that successful projects often take from 20-25 years to reach the stage of full industry adoption, while many other projects fizzle out and never advance beyond the initial research phase. In this interactive panel, teams of researchers representing several different requirements engineering research areas, bring ideas for technology transfer to a panel of industrial and government practitioners. The teams proceed through a series of interactive presentations and receive feedback from panelists. Underlying the game-show genre of the panel is the more serious goal to foster conversation between practitioners and researchers in order to improve the effectiveness of technology transfer in the requirements engineering community.

关键词： Technology transfer Industries Communities Software Software engineering Educational institutions Conferences

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A distributed look-up architecture for text mining applications using MapReduce

A distributed look-up architecture for text mining applicati...

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Supercomputing Conference

作者： Atilla Soner Balkir Ian Foster Andrey Rzhetsky Department of Computer Science University of Chicago Chicago IL USA Department of Computer Science Computation Institute University of Chicago and Argonne National Laboratory Chicago IL USA Departments of Medicine and Human Genetics Computation Institute Institute for Genomics and University of Chicago Chicago IL USA

We study text analysis algorithms that use global optimization methods to compute local characteristics that are consistent with properties of the entire corpus rather than computed locally based on exogenous parameters. In the iterative implementations that we consider, each step both reads and updates a database of parameter values. Motivated by a need for rapid analysis of large corpora, we have developed methods for efficient access to such databases on parallel computers. These methods combine Bloom filters, in-memory caches, and an HBase cluster to reduce communication costs greatly relative to simpler approaches that either fully distribute or fully replicate the database. We also describe how this method can be incorporated into the MapReduce programming model, and illustrate its use within phrase segmentation programs. Our design can achieve considerable run time, latency and storage space improvements relative to other methods. In one phrase segmentation application, we improve performance by a factor of six relative to an HBase-based implementation.

关键词： Distributed databases Computational modeling Text mining Data models Time frequency analysis Search engines

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A prediction model for differentiating chronic pain patients and healthy subjects based on withdrawal reflex EMG signals

A prediction model for differentiating chronic pain patients...

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International IEEE/EMBS Conference on Neural Engineering, CNE

作者： G. P. Nguyen J. A. Biurrun Manresa M. Curatolo T. B. Moeslund O. K. Andersen Center of Sensory-Motor Interaction Department of Health Science and Technology University of Aalborg Denmark University Department of Anaesthesiology and Pain Therapy Inselspital Bern Switzerland Computer Vision and Media Technology Laboratory Department of Architecture Design and Media Technology University of Aalborg Denmark

The nociceptive withdrawal reflex (NWR) has been proven to be a valuable tool in the objective assessment of spinal cord hyperexcitability that is present in chronic pain disorders. However, most of the studies on objective assessment of central sensitisation focus on population differences between patients and healthy individuals and do not provide tools for individual assessment. In this study, a method was developed to objectively assess pain hyperexcitability in individuals using the NWR. Results showed high rate of correct assessment with up to ~80% when differentiating between healthy volunteers and chronic pain patients.

关键词： Training Pain Electromyography Predictive models Probability distribution Electrodes Histograms

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