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2012 5th Workshop on Software Engineering and Architectures for Realtime Interactive Systems, SEARIS 2012

作者： Pavlik, Ryan A. Vance, Judy M. Human-Computer Interaction Graduate Program Iowa State University United States Virtual Reality Applications Center Iowa State University United States

ISBN: (纸本)9781467312493

A gap exists between virtual reality (VR) software platforms designed for optimum hardware abstraction and cluster support, and those designed for efficient content authoring and exploration of interaction techniques through prototyping. This paper describes VR JuggLua, a high-level virtual reality application framework based on combining Lua, a dynamic, interpreted language designed for embedding and extension, with VR Juggler and OpenSceneGraph. This work allows fully-featured immersive applications to be written entirely in Lua, and also supports the embedding of the Lua engine in C++ applications. Like native C++ VR Juggler applications, VR JuggLua-based applications run successfully on systems ranging from a single desktop machine to a 49-node cluster. The osgLua introspection-based bindings facilitate scenegraph manipulation from Lua code, while bindings created using the Luabind template meta-programming library connect VR Juggler functionality. A thread-safe run buffer allows new Lua code to be passed to the interpreter during run time, supporting interactive creation of scene-graph structures. It has been successfully used in an immersive application implementing two different navigation techniques entirely in Lua and a physically-based virtual assembly simulation where C++ code handles physics computations and Lua code handles all display and configuration. © 2012 IEEE.

关键词： human computer interaction

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Graphics hardware acceleration of Particle Swarm Optimization with digital pheromones using the CUDA architecture 12

Graphics hardware acceleration of Particle Swarm Optimizatio...

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12th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference and 14th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference

作者： Kalivarapu, Vijay Winer, Eliot Virtual Reality Applications Center Iowa State University Ames IA 50011 United States Mechanical Engineering Department Human Computer Interaction Virtual Reality Applications Center Iowa State University 1620 Howe Hall Ames IA 50011 United States

ISBN: (数字)9781600869303

ISBN: (纸本)9781600869303

Modern GPUs have proven to outperform the number of floating point operations when compared to CPUs through inherent data parallel architecture and higher bandwidth capabilities. The advent of programmable graphics hardware in recent times further provided a suitable platform for scientific computing, particularly in the field of population based optimization algorithms. Previous work by the authors demonstrated the capability of digital pheromones within PSO for searching n-dimensional design spaces with improved accuracy, efficiency and reliability in both serial and parallel CPU computing environments. Preliminary GPU implementations were also made using OpenCL and OpenGL Shading Languge by off-loading objective function evaluations to the GPU. In this paper, hardware acceleration of Particle Swarm Optimization with digital pheromones using the CUDA architecture on commodity Graphics Processing Unit (GPU) is investigated and presented. Specifically, two objectives will be attained in this work: 1) a successful implementation of PSO with digital pheromones on a high-end workstation GPU and a popular low-cost consumer level GPU and 2) results comparison between these implementations. Based on testing the algorithm with a number of unconstrained problems, recommendations will be made on the suitability of high-end or consumer level GPUs for solving population based optimization problems.© 2012 by Vijay Kalivarapu and Eliot Winer.

关键词： Graphics processing unit

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Puzzle assembly training: Real world vs. virtual environment

Puzzle assembly training: Real world vs. virtual environment

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IEEE Annual International Symposium virtual reality

作者： Mike Oren Patrick Carlson Stephen Gilbert Judy M. Vance Human Computer Interaction Program Virtual Reality Applications Center Iowa State University Ames IA USA Mechanical Engineering Department and Human Computer Interaction Program Virtual Reality Applications Center Iowa State University Ames IA USA

While training participants to assemble a 3D wooden burr puzzle, we compared results of training in a stereoscopic, head tracked virtual assembly environment utilizing haptic devices and data gloves with real world training. While virtual training took participants about three times longer, the group that used the virtual environment was able to assemble the physical test puzzle about three times faster than the group trained with the physical puzzle. We present several possible cognitive explanations for these results and our plans for future exploration of the factors that improve the effectiveness of virtual process training over real world experience.

关键词： Training Assembly virtual environments Haptic interfaces Testing virtual groups

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VR JuggLua: A framework for VR applications combining Lua, OpenSceneGraph, and VR Juggler

VR JuggLua: A framework for VR applications combining Lua, O...

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Workshop on Software Engineering and Architectures for Realtime Interactive Systems (SEARIS)

作者： Ryan A. Pavlik Judy M. Vance Human-Computer Interaction Graduate Program Iowa State University USA Virtual Reality Applications Center Iowa State University USA

关键词： virtual reality Libraries Kernel Transforms Syntactics Solid modeling

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Left ventricle segmentation with mixture of Gaussian active contours

Left ventricle segmentation with mixture of Gaussian active ...

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IEEE International Symposium on Biomedical Imaging

作者： Xiaoxu Wang Qingmao Hu Pheng Ann Heng Human Computer Interaction Centre Shenzhen Institute of Advanced Technology Shenzhen Guangdong China Virtual Reality Visualization and Imaging Research Centre Department of Computer Science and Engineering Chinese University of Hong Kong Sha Tin New Territories Hong Kong China

Cine MRI is an imaging technique for visualizing the left ventricle wall motion in a heart beating cycle. The paper proposed a method to semi-automatically segment the left ventricle (LV) boundaries from a stack of cine MRI and build a LV mesh. The different intensities in the MRI are modeled with the mixture of Gaussian method. The thresholds between them are semi-automatically determined by K-means initialization and the expectation maximization (EM) method. The spatial constrain is added into the model with active contour models, which fit explicit contours on the boundary of the area of interest. We propose a marching cube alike initialization method of the active contour models. A 3D mesh is built from a stack of contours and smoothed afterwards. Stroke volume, myocardium mass and ejection function can be estimated from the LV boundary mesh and the endocardium mesh.

关键词： Magnetic resonance imaging Active contours Image segmentation Cavity resonators Image reconstruction Myocardium

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A simple method to simulate waved water

A simple method to simulate waved water

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3rd International Conference on Image Analysis and Signal Processing, IASP 2011

作者： Li, Qiaoyu Meng, Xiangxu Research Center of Human Computer Interaction and Virtual Reality Shandong University China

ISBN: (纸本)9781612848808

This paper presents a method to simulate water waves. First, in the making of water waves, the method based on Airy waves is easily implemented and has a fine effect. Second, the method based on Gerstner waves is physical and can make breaking waves. So we combined the two methods together and proposed a simple method to make water waves. Compared with other methods, our method is easily implemented to simulate many forms of water waves such as lake waves, ocean waves and breaking waves. © 2011 IEEE.

关键词： Water waves

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Designing for cultural connections

Designing for cultural connections

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14th International Conference on human-computer interaction, HCI International 2011

作者： Peters, Anicia Mennecke, Britta Camou, José Herdem, Kiraz Candan Zhang, Lei Human Computer Interaction Program Virtual Reality Applications Center 1620 Howe Hall United States Art and Design 146 College of Design Iowa State University Ames IA 50011 United States

ISBN: (纸本)9783642220975

The 2010 earthquake in Haiti not only devastated the country's infrastructure, it also left many orphaned children, which accelerated the pace of international transracial adoptions by families in the United States and other developed countries. While international adoptees such as these Haitian children are older and will therefore likely remember some aspects of their birth culture, often younger children are at risk of forgetting much of their cultural and linguistic heritage. Despite much research on international transracial adoptions, surprisingly few web-based resources are available to adoptees for exploring and connecting with their birth cultures. To address this shortcoming, we used an iterative approach of ethnographic methods, paper prototypes, usability testing and heuristic evaluations to design Synergy, a system which allows adoptees to explore and connect with their birth cultures and its people autonomously. © 2011 Springer-Verlag.

关键词： Iterative methods

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The role of dynamic digital menu boards in consumer decision making

The role of dynamic digital menu boards in consumer decision...

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作者： Peters, Anicia Mennecke, Brian Human Computer Interaction Virtual Reality Applications Center 1620 Howe Hall Ames IA 50011 United States Supply Chain and Information Systems College of Business 3313 Gerdin Ames IA 50011 United States

ISBN: (纸本)9781450302289

Digital Signage has become a common-place feature in many public spaces and retail establishments;yet, only limited research has been reported to date on these technologies. For example, questions such as their effect on decision-making, cognitive load, and purchase behavior have yet to be examined. In an effort to attract more attention and increase effectiveness, venders of digital signage are rapidly enhancing features and capabilities for these displays. For example, displays are moving from simple 2d screens to 3d auto-stereoscopic screens, screens featuring multimodal forms of interaction are replacing static displays, and display-only screens are being replaced by displays capable of recognizing user characteristics. An important "new" type of display is the dynamic digital menu board, which combines digital signage with the power of video. Surprisingly, despite its increasingly common use in areas as diverse as education and retail, only limited academic research on digital signage has been conducted in areas such as marketing with little attention coming from the HCI field. Our research is focused on addressing this shortcoming by applying theories from HCI, marketing, and information systems to investigate the role of video and dynamic digital menu board display characteristics on consumer decision-making. We hypothesize that each consumer decision-making stage will be affected by the "vividness" of video in dynamic digital menu boards.

关键词： Stereo image processing

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Can digital signage help consumers eat healthier?

Can digital signage help consumers eat healthier?

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14th International Conference on human-computer interaction, HCI International 2011

作者： Peters, Anicia Mennecke, Brian Human Computer Interaction Program Virtual Reality Applications Center Iowa State University Ames IA 50011 United States Supply Chain and Information Systems College of Business Iowa State University Ames IA 50011 United States

ISBN: (纸本)9783642220944

Digital signage has become prevalent in public spaces, but consumers are faced with many choices from various displays with the result that consumers often ignore important information. To "recover" customer attention, various retailers have recently begun to deploy dynamic digital menu boards, which are plasma screens that combine the power of video with multimedia content. We examine the effect of these boards on healthy eating, a topic that has been on the national agenda for some time as Americans struggle with obesity. The introduction of a specialized form of dynamic digital menu boards in fast food restaurants has the potential to increase unhealthy eating if retailers were to use them to "upsell" consumers to higher margin but less healthy menu items. By the same token, these boards could also be used to influence consumers to make healthier food choices resulting in benefits to the consumer and society. © 2011 Springer-Verlag.

关键词： Sales

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Hidden information in Microsoft Word

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International Journal of Security and Networks 2011年第2-3期6卷 123-135页

作者： Liu, Li Xiao, Yang Zhang, Jingyuan Faulkner, Andrew Weber, Keith Center of Human Computer Interaction and Virtual Reality College of Computer Science and Technology Shandong University Jinan Shandong 250101 China Department of Computer Science University of Alabama Tuscaloosa AL 35487 United States

There is no doubt that Microsoft Word is the leading personal word processing software on the Windows platform. The intuitive user interface provides convenient editing as if it was doing so on a real note pad for publication. Even though users apparently see what they put on the electronic document in Word format, not-apparent information is recorded by the software itself based on the users' behaviour or identification. This information is called 'Hidden Information'. In this paper, we discuss what is concealed in the Word file and its related issues. © 2011 Inderscience Enterprises Ltd.

关键词： Security of data

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