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International Conference on Cognitive Infocommunications (CogInfoCom)

作者： Attila Bérczes Tamás Bérczes Imre Varga Attila Tiba Judit Zsuga Institute of Mathematics University of Debrecen Debrecen Hungary Department of Information Technology University of Debrecen Debrecen Hungary Department of Computer Graphics and Image Processing University of Debrecen Debrecen Hungary Department of Health Systems Management and Quality Management in Health Care University of Debrecen Debrecen Hungary

We analyze a database containing medical data of patients who suffered hemorrhagic stroke. From the original database we built the corresponding comorbidities network, and we analyzed this network using a graph theore... 详细信息

ISBN: (数字)9781728147932

ISBN: (纸本)9781728147949

关键词： Eigenvalues and eigenfunctions Laplace equations Hemorrhaging Symmetric matrices Databases Diseases Medical diagnostic imaging

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Performance Analysis of a Cloud Computing System using Queuing Model with Correlated Task Reneging

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Journal of Physics: Conference Series 2021年第1期2091卷

作者： Rakesh Kumar Bhavneet Singh Soodan Godlove Suila Kuaban Piotr Czekalski Sapana Sharma School of Mathematics Shri Mata Vaishno Devi University Katra Jammu and Kashmir 182320 India Department of Mathematics and Statistics Namibia University of Science and Technology Private Bag 13388 Windhoek Namibia 13 Jackson Kaujeua Street Windhoek Namibia Institute of Theoretical and Applied Informatics Polish Academy of Sciences Baltycka 5 44-100 Gliwice Poland Department of Computer Graphics Vision and Digital Systems Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Department of Mathematics Cluster University of Jammu Jammu and Kashmir

Queuing theory has been extensively used in the modelling and performance analysis of cloud computing systems. The phenomenon of the task (or request) reneging, that is, the dropping of requests from the request queue often occur in cloud computing systems, and it is important to consider it when developing performance evaluations models for cloud computing infrastructures. Majority of studies in the performance evaluation of cloud computing data centres with the use of queuing theory do not consider the fact that the tasks could be removed from queue without being serviced. The removal of tasks from the queue could be due to the user impatience, execution deadline expiration, security reasons, or as an active queue management strategy. The reneging could be correlated in nature, that is, if a request is dropped (or reneged) at any time epoch, and then there is a probability that a request may or may not be dropped at the next time epoch. This kind of dropping (or reneging) of requests is referred to as correlated request reneging. In this paper we have modelled a cloud computing infrastructure with correlated request reneging using queuing theory. An M/M/1/N queuing model with correlated reneging has been used to study the performance analysis of the load balancing server of a cloud computing system. The steady-state as well as the transient performance analyses have been carried out. Important measures of performance like average queue size, average delay, probability of task blocking, and the probability of no waiting in the queue are studied. Finally, some comparisons are performed which describe the effect of correlated task reneging over simple exponential reneging.

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Automated walkable area segmentation from aerial images for evacuation simulation 1

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2nd International Conference on Geographical Information Systems Theory, Applications and Management, GISTAM 2016

作者： Schenk, Fabian Rüther, Matthias Bischof, Horst Institute for Computer Graphics and Vision Graz University of Technology Graz Austria

ISBN: (数字)9783319626185

ISBN: (纸本)9783319626178

In this paper, we propose a novel, efficient and fast method to extract the walkable area from high-resolution aerial images for the purpose of computer-aided evacuation simulation for major public events. Compared to previous work, where authors only extracted roads and streets or solely focused on indoor scenarios, we present an approach to fully segment the walkable area of large outdoor environments. We address this challenge by modeling human movements in the terrain with a sophisticated seeded region growing algorithm (SRG), which utilizes digital surface models, true-orthophotos and inclination maps computed from aerial images. Further, we propose a novel annotation and scoring scheme especially developed for assessing the quality of the extracted evacuation maps. Finally, we present an extensive quantitative and qualitative evaluation, where we show the feasibility of our approach by evaluating different combinations of SRG methods and parameter settings on several real-world scenarios. © Springer International Publishing AG 2017.

关键词： Image segmentation

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HIPS - A Virtual Reality Hip Prosthesis Implantation Simulator

HIPS - A Virtual Reality Hip Prosthesis Implantation Simulat...

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IEEE Annual International Symposium Virtual Reality

作者： Maximilian Kaluschke René Weller Gabriel Zachmann Luigi Pelliccia Mario Lorenz Philipp Klimant Sebastian Knopp Johannes P. G. Atze Falk Móckel Computer Graphics and Virtual Reality University of Bremen Chernnitz University of Technology IWP CAT PRODUCTION FAKT Software

ISBN: (纸本)9781538633663

We present the first VR training simulator for hip replacement surgeries. We solved the main challenges of this task - high and stable forces during the milling process while simultaneously a very sensitive feedback is required - by using an industrial robot for the force output and the development of a novel massively parallel haptic rendering algorithm with support for material removal.

关键词： Haptic interfaces Hip Surgery Rendering (computer graphics) Training Robots Milling

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On the Delay Performance of Browser-based Interactive TCP Free-viewpoint Streaming

On the Delay Performance of Browser-based Interactive TCP Fr...

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IFIP Networking Conference

作者： Tilak Varisetty Markus Fidler Matthias Ueberheide Marcus Magnor Institute of Communications Technology Leibniz Universität Hannover Computer Graphics Lab Technische Universität Braunschweig

ISBN: (纸本)9781538662809;9783903176089

In free-viewpoint video arbitrary views of a scene or an object are rendered from a 3-dimensional scene representation that is obtained using multiple cameras or generated by computer graphics. The interactivity that is due to the viewpoint selection is particularly challenging in case of networked applications, where a server renders the scene from a viewpoint that is chosen by a remote client. Relying on widely-used standard browser-based video streaming technology, data transport is performed by the Transmission Control Protocol (TCP), implying an anticipated risk of potentially large delays. The magnitude, frequency, and origin of such delays are the focus of this work. To investigate the tail distribution of the delays, we use a controlled testbed environment and instrument the entire video streaming chain from the server-side renderer to the display at the client using various measurement points. We identify three major sources of delays: the video coders, the protocol stack, and the network. We investigate the causes of these delays and show a strong impact of network parameters, such as round-trip time and packet loss probability, on protocol stack delays. While stack delays can significantly exceed network delays, we find that stack delays can be reduced effectively by adapting the parameters of the video encoder.

关键词： Delays Streaming media Servers Cameras Rendering (computer graphics) Switches Protocols

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Design of Intelligent Robot Platform based on Multi-sensor Fusion

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Journal of Physics: Conference Series 2020年第1期1606卷

作者： Ya Dajin Lei Xiaochun Li Yue Chen Junyan Huang Rongcun Lan Lin School of computer and information security Guilin University of Electronic Technology Guilin 541004 China Guangxi Colleges and Universities Key Laboratory of Intelligent Processing of Computer Images and Graphics Guilin 541004 China Guangxi Cooperative Innovation Center of cloud computing and Big Data Guilin University of Electronic Technology Guilin 541004 China

The mobile robot adapts to the more complicated indoor and outdoor environments, and can expand its scope of application. In order to reduce the influence of the cumulative error caused by navigation in complex environments, the indoor mobile robot that combines Inertial Measurement Unit (IMU) and encoder fusion is designed and implemented. In view of the limitations of the traditional single lidar scheme, a Multi-sensor Fusion scheme is proposed to achieve indoor map construction, path planning, multi-point navigation and other functions, and a MSIF KartoSLAM (Multi-sensor Information Fusion) algorithm is proposed, which combines the KartoSLAM algorithm and Multi-sensor information to achieve map construction in complex environments. Through comprehensive testing in the indoor environment, the results show that the Multi-sensor Fusion scheme is superior to the traditional single lidar scheme, and can achieve higher accuracy in mapping and navigation. At the same time, the robot platform can also be combined with the Internet of Things technology and integrated into intelligent housing system.

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Design of People Flow Monitoring System in Public Place based on MD-MCNN

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Journal of Physics: Conference Series 2020年第1期1606卷

作者： Xiong Tianmin Lei Xiaochun Zheng Xingwen Chen Junyan Feng Yizhou School of computer and information security Guilin University of Electronic Technology Guilin 541004 China Guangxi Colleges and Universities Key Laboratory of Intelligent Processing of Computer Images and Graphics Guilin 541004 China Guangxi Cooperative Innovation Center of cloud computing and Big Data Guilin University of Electronic Technology Guilin 541004 China

Due to the limitation of hardware resources, the traditional people flow monitoring system based on computer vision in public places can't meet different crowd-scale scenarios. Therefore, a people flow monitoring system based on MD-MCNN algorithm is designed, which is an application system combining the improved SSD object detection algorithm MNSSD and MCNN density map regression algorithm. In the initial stage, the system uses MNSSD for accurate detection and counting. If the people flow gradually reaches a certain threshold, the system automatically uses MCNN to estimate people flow until the people flow falls below the threshold. Through the experimental verification, the system can realize the people flow statistics of low-density and high-density people in different scenarios, and can be applied on the existing embedded platform. This scheme can be extended to smart cities, smart scenic spots, smart transportation and other fields.

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Generating Mobile Application Onboarding Insights Using Minimalist Instruction

Generating Mobile Application Onboarding Insights Using Mini...

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作者： Strahm Brendan Robert Purdue University Computer Graphics Technology

学位级别：M.S.

In this study, I created and validated a research-informed protocol to answer the question, "How can user experience UX) designers generate design insights for mobile application onboarding through the lens of minimalist instruction?"High first-day abandonment rates for mobile applications indicate an opportunity for improvement by adding onboarding, which encompasses design elements and principles that help new users successfully accomplish their goals. Engaging new users in meaningful interaction was a critical part of onboarding effectiveness. However, common methods for generating onboarding design insights were ineffective at eliciting and capturing meaningful onboarding interaction. I proposed a protocol that provides such *** protocol drew on minimalist instruction principles to engage twelve participants in an iterative set of design and evaluation activities using a physical prototype. The first six participants completed preset tasks, translated the experiences into card-based task flows, and optimized them. I generated onboarding design insights from the card task flows and recordings. Then, I made some minor protocol refinements and engaged the last six participants in semi-structured prototype exploration and reflection bookended by structured mini-interviews. This allowed me to capture participant meaning-making processes into a card-based task flow during interaction instead of after. I generated design insights in this round using the card task flows, session transcripts, and structured mini-interviews. The first approach generated some useful insights, but the insights of the second approach were more nuanced and incisive.

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Design and Development of 'VR + Arduino' Immersion Interactive Experiment Case

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Journal of Physics: Conference Series 2021年第3期1802卷

作者： Jiu Yong Yangping Wang Jianwu Dang Introduction of Computer Science and Technology Experimental Teaching Demonstration Center of national Lanzhou Jiaotong University LanZhou 730070 China The National Virtual Simulation Experiment Teaching Center of Railway Traffic Information and Control Lanzhou Jiaotong University Lanzhou 730070 China Gansu Provincial Engineering Research Center for Artificial Intelligence and Graphics & Image Processing LanZhou 730070 China

In order to guide students to master Arduino development board, sensors, unity3d and other software and hardware application methods, familiar with the development process of virtual reality and intelligent hardware control platform. Learning from the WeChat 'jump and jump' finger game, based on virtual reality technology and Arduino intelligent hardware control platform, the virtual intelligent fitness device with good immersion, strong interactivity, and combining entertainment, exercise and virtual experience is developed and designed. The 'virtual reality + Arduino' immersion interactive experimental platform provides immersive and interactive immersive helmet and desktop screen display modes, uses a variety of intelligent control methods such as in-situ jumping action or grip to replace the finger pressing action in WeChat to control the jump of the game model, and can choose the sky, ocean, land and other fitness Scene, to achieve physical exercise and intellectual purposes. In the process of case design and production, virtual reality immersion equipment, grip and running pad are combined with fitness to cultivate students' comprehensive practical innovation ability.

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Real-Time Indoor Airflow Visualization for Sustainable Architectural Design

Real-Time Indoor Airflow Visualization for Sustainable Archi...

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作者： Scalone Vincent Purdue University Computer Graphics Technology

学位级别：M.S.

aCurrently, methods to analyze indoor airflow are restricted to an engineering point of view. These methods are often time consuming and very specialized. This research examines how virtual reality can play a role in architectural visualization and interior design by visualizing indoor airflow in a residential setting. A study was conducted in which users experienced an interactive visualization to determine if virtual reality aided their understanding of airflow in a given room. Suggestions were then offered on how this research could be expanded and incorporated into interior design to improve the airflow quality of indoor environments.

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