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the Effect of Graph Layout on the Perception of Graph Density: An Empirical Study

The Effect of Graph Layout on the Perception of Graph Densit...

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24th Eurographics conference on Visualization, EuroVis 2022

作者： Kypridemou, E. Zito, M. Bertamini, M. Department of Computer Science University of Liverpool United Kingdom Visual Perception Lab Department of Psychological Sciences University of Liverpool United Kingdom

ISBN: (纸本)9783038681847

the visual representation of a graph is crucial in understanding and analyzing its properties. In this empirical study, we examine the effect of different drawing layouts on our perception of graph density. We treat density as an absolute property of the graph and use a Yes-No design, where participants have to decide whether a graph has a given density or not. We compare a simple grid layout with well-known planar and spring layouts. We also introduce an alternative 'improved' grid layout, which reduces the number of crossings while keeping most of the simplicity of the original grid layout. Results show that our 'improved' version of the grid layout facilitated performance on the task, compared to the original one. Moreover, participants were biased into judging graphs as denser when drawn with the original grid layout, while tended to perceive graphs as less dense when drawn with the planar and grid layouts. In contrast to previous studies on graph density perception, this is the first indication that the chosen layout can influence our perception of the graph's density. © 2022 the Author(s) © 2022 the Eurographics Association.

关键词： Drawing (graphics)

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Modal spring Reverb Based on Discretisation of the thin Helical spring Model

Modal Spring Reverb Based on Discretisation of the Thin Heli...

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Digital Audio Effects (DAFx), International conference on

作者： Jacob McQuillan Maarten van Walstijn Sonic Arts Research Centre School of Arts English and Languages Queen's University Belfast UK Sonic Arts Research Centre School of Electronics Electrical Engineering and Computer Science Queen's University Belfast UK

ISBN: (纸本)9781665439527

the distributed nature of coupling in helical springs presents specific challenges in obtaining efficient computational structures for accurate spring reverb simulation. For direct simulation approaches, such as finite-difference methods, this is typically manifested in significant numerical dispersion within the hearing range. Building on a recent study of a simpler spring model, this paper presents an alternative discretisation approach that employs higher-order spatial approximations and applies centred stencils at the boundaries to address the underlying linear-system eigenvalue problem. Temporal discretisation is then applied to the resultant uncoupled mode system, rendering an efficient and flexible modal reverb structure. through dispersion analysis it is shown that numerical dispersion errors can be kept extremely small across the hearing range for a relatively low number of system nodes. Analysis of an impulse response simulated using model parameters calculated from a measured spring geometry confirms that the model captures an enhanced set of spring characteristics.

关键词： Couplings Analytical models Computational modeling Auditory system Rendering (computer graphics) Loss measurement Eigenvalues and eigenfunctions

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How to half the latency of IEEE compliant floating-point multiplication

How to half the latency of IEEE compliant floating-point mul...

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EUROMICRO conference

作者： P.-M. Seidel Computer Science Department University of Saarland Saarbrucken Germany

We present an IEEE compliant floating-point multiplier that computes the correctly rounded result for all representable floating-point values. this multiplier can be implemented in 2 clock cycles, whenever its adder tree fits in one clock cycle. For the same operation recent multiplier designs need at least 4 clock cycles including the pre and postprocessing for denormalized operands and multistep rounding for the support of different precisions. Our multiplier operates on an internal format that we introduce before. We discuss the changes that become necessary by the use of this format and the optimizations that are possible for the other arithmetic operations.

关键词： Delay Clocks Registers Microprocessors computer science Design optimization Floating-point arithmetic graphics Hardware

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Streamlining GPU applications on the fly - thread divergence elimination through runtime thread-data remapping 10

Streamlining GPU applications on the fly - Thread divergence...

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24th ACM International conference on Supercomputing, ICS'10

作者： Zhang, Eddy Z. Jiang, Yunlian Guo, Ziyu Shen, Xipeng Computer Science Department College of William and Mary Williamsburg VA 23185 United States

ISBN: (纸本)9781450300186

Because of their tremendous computing power and remarkable cost efficiency, GPUs (graphic processing unit) have quickly emerged as a kind of influential platform for high performance computing. However, as GPUs are designed for massive data-parallel computing, their performance is subject to the presence of condition statements in a GPU application. On a conditional branch where threads diverge in which path to take, the threads taking different paths have to run serially. Such divergences often cause serious performance degradations, impairing the adoption of GPU for many applications that contain non-trivial branches or certain types of loops. this paper presents a systematic investigation in the employment of runtime thread-data remapping for solving that problem. It introduces an abstract form of GPU applications, based on which, it describes the use of reference redirection and data layout transformation for remapping data and threads to minimize thread divergences. It discusses the major challenges for practical deployment of the remapping techniques, most notably, the conflict between the large remapping overhead and the need for the remapping to happen on the fly because of the dependence of thread divergences on runtime values. It offers a solution to the challenge by proposing a CPU-GPU pipelining scheme and a label-assign-move (LAM) algorithm to virtually hide all the remapping overhead. At the end, it reports significant performance improvement produced by the remapping for a set of GPU applications, demonstrating the potential of the techniques for streamlining GPU applications on the fly. © 2010 ACM.

关键词： graphics processing unit

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Parallelization of volume visualization on computer networks

Parallelization of volume visualization on computer networks

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EUROMICRO conference

作者： M. Schule M. Meissner WSI/GRIS University of Tubingen Tubingen Germany Eberhard Karls Universitat Tubingen Tubingen Baden-WÃ¼rttemberg DE

Many algorithms in the field of scientific visualization require high computational capacity. In general, low-end machines are not capable of delivering sufficient performance to achieve interactivity. Even worse, to generate high quality images of large data sets, the necessary time is in the order of minutes. Besides algorithmic optimizations, parallelization is necessary to quicken the computation to enable some interactivity to comprehensively understand the volumetric data. In this paper we present the implementation of two visualization algorithms using PVM. To circumvent stall conditions and to guarantee a somehow continuous time per frame, we propose different scheduling schemes. Both algorithms are tested using the different strategies in a multi-user environment and in a dedicated network of workstations.

关键词： computer networks Data visualization Biomedical imaging Concurrent computing Rendering (computer graphics) Switches Data mining US Department of Transportation Processor scheduling Testing

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Rendering the interaction more human-like in an intelligent GUI

Rendering the interaction more human-like in an intelligent ...

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International conference on Information Technology Interfaces

作者： M. Virvou K. Kabassi Department of Informatics University of Piraeus Piraeus Greece

this paper describes how certain forms of multimedia can be combined with the principles of a cognitive theory in order to improve human-computer interaction. An animated, speech-driven agent has been developed in order to simulate a human expert. However, the main focus of this research is on adapting a theory of human plausible reasoning in order to render the agent's interaction with the user more human-like. the agent uses this reasoning while watching the user "over the shoulder" so that it can decide on the advice that fits the user better. the evaluation of the interface revealed that human-computer interaction can successfully be improved by the adaptation of such an animated, speech-driven agent, when it can reproduce human reasoning.

关键词： Graphical user interfaces Humans Animation User interfaces Intelligent agent Rendering (computer graphics) Psychology Intelligent systems Multiagent systems Monitoring

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Fast prototyping of an interface between new bedside device and computerized fetal monitoring system

Fast prototyping of an interface between new bedside device ...

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Annual International conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： J. Jezewski K. Horoba J. Wrobel A. Matonia T. Kupka Department of Biomedical Informatics Institute Medical Technology and Equipment Zabrze Poland

Noninvasive measurement of oxygen saturation of fetal blood is a valuable supplement to conventional intrapartum cardiotocography in the area of fetal distress diagnostics. this work focuses on the technical problems that were overcome in incorporation of the new pulse oximetry feature into computerized fetal monitoring system. the prototype system is based on battery-powered notebook computer and its software was developed in LabView graphic applications environment. It made possible the investigation of the pulse oximeter ability to cooperate with various types of fetal monitors and the implementation of validation procedure for measurements.

关键词： Prototypes computer interfaces computerized monitoring Pulse measurements Noninvasive treatment Blood Cardiography Software prototyping computer graphics Application software

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Multimedia methods for presentation based on CAD data in industrial product development

Multimedia methods for presentation based on CAD data in ind...

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Annual conference of Industrial Electronics Society

作者： P. Drews M. Weyrich European Centre for Mechatronics Aachen Germany

this paper describes multimedia approaches for the presentation of industrial products based on CAD data. Product presentation in an early project state is a key factor to ensure that a design and construction is well matched with the requirements and favoured by the customers. the methods of computer animation and multimedia interactive presentation are presented. An example of an industrial construction machine design is used to outline the procedures, problems and potentials of the approaches. the research results were intensively studied by means of demonstrations to industry and public regarding their efficiency and the scope of industrial applicability.

关键词： Multimedia systems Product development Animation Visualization Construction industry Rendering (computer graphics) Machinery production industries Design engineering Design automation Manufacturing industries

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Hardware-software run-time systems and robotics: a case study

Hardware-software run-time systems and robotics: a case stud...

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EUROMICRO conference

作者： V.J. Mooney D. Ruspini O. Khatib G. De Micheli School of Electrical aid Computcr Engineering Georgia Institute of Technology USA

We present a sample implementation of a run time scheduler, split between hardware and software, controlling a real time robotics application. the hardware part of the run time scheduler, implemented as a finite state machine (FSM), schedules the tasks for the application and can be readily extended to include additional tasks in hardware or in software. the software part executes tasks based on which tasks are ready to execute as indicated by the FSM. We have successfully implemented the scheduler on a working prototype which shows the feasibility of our approach.

关键词： Robots computer aided software engineering Hardware Application software Haptic interfaces graphics Displays Laboratories Prototypes Yarn

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Single camera pointing gesture recognition for interaction in edutainment applications 08

Single camera pointing gesture recognition for interaction i...

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proceedings of the 24th spring conference on computer graphics

作者： Z. Černeková C. Malerczyk N. Nikolaidis I. Pitas Comenius University Bratislava Slovakia ZGDV Computer Graphics Center Germany Aristotle University of Thessaloniki Greece

ISBN: (纸本)9781605589572

In this paper, a method for recognizing pointing gestures without markers is proposed. the video-based system uses one camera only, which observes the user in front of a large screen and identifies the 2D position pointed by him/her on this screen, his/her arm being in the fully extended position towards the screen. A GVF-snake is used in order to detect the pointing hand of the user, which is tracked in the following frames using the particle filters tracker. the center of gravity of the snake is used as a feature point and is transformed using linear transformation directly into the canvas coordinates. the method was tested on a large screen using applications designed for a wide range of different and even technically unversed users such as an image exploration for a virtual museum exhibit or intuitive interaction applications for gaming purposes. Experiments show very promising results for recognizing the pointing gestures by using a single camera.

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