The Experts below are selected from a list of 333 Experts worldwide ranked by ideXlab platform
Timothy Wood - One of the best experts on this subject based on the ideXlab platform.
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Adaptive dynamic priority scheduling for virtual desktop infrastructures
2012 IEEE 20th International Workshop on Quality of Service, 2012Co-Authors: Jinho Hwang, Timothy WoodAbstract:Virtual Desktop Infrastructures (VDIs) are gaining popularity in cloud computing by allowing companies to deploy their office environments in a virtualized setting instead of relying on physical desktop machines. Consolidating many Users into a VDI environment can significantly lower IT management expenses and enables new features such as “available-anywhere” desktops. However, barriers to broad adoption include the slow performance of virtualized I/O, CPU scheduling interference problems, and shared-cache contention. In this paper, we propose a new soft real-time scheduling algorithm that employs flexible priority designations (via utility functions) and automated scheduler class detection (via hypervisor monitoring of User behavior) to provide a higher Quality User Experience. We have implemented our scheduler within the Xen virtualization platform, and demonstrate that the overheads incurred from co-locating large numbers of virtual machines can be reduced from 66% with existing schedulers to under 2% in our system. We evaluate the benefits and overheads of using a smaller scheduling time quantum in a VDI setting, and show that the average overhead time per scheduler call is on the same order as the existing SEDF and Credit schedulers.
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IWQoS - Adaptive dynamic priority scheduling for virtual desktop infrastructures
2012 IEEE 20th International Workshop on Quality of Service, 2012Co-Authors: Jinho Hwang, Timothy WoodAbstract:Virtual Desktop Infrastructures (VDIs) are gaining popularity in cloud computing by allowing companies to deploy their office environments in a virtualized setting instead of relying on physical desktop machines. Consolidating many Users into a VDI environment can significantly lower IT management expenses and enables new features such as "available-anywhere" desktops. However, barriers to broad adoption include the slow performance of virtualized I/O, CPU scheduling interference problems, and shared-cache contention. In this paper, we propose a new soft real-time scheduling algorithm that employs flexible priority designations (via utility functions) and automated scheduler class detection (via hypervisor monitoring of User behavior) to provide a higher Quality User Experience. We have implemented our scheduler within the Xen virtualization platform, and demonstrate that the overheads incurred from co-locating large numbers of virtual machines can be reduced from 66% with existing schedulers to under 2% in our system. We evaluate the benefits and overheads of using a smaller scheduling time quantum in a VDI setting, and show that the average overhead time per scheduler call is on the same order as the existing SEDF and Credit schedulers.
Sanaa Sharafeddine - One of the best experts on this subject based on the ideXlab platform.
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An optimized approach to video traffic splitting in heterogeneous wireless networks with energy and QoE considerations
Journal of Network and Computer Applications, 2017Co-Authors: Nadine Abbas, Karim Jahed, Hazem Hajj, Zaher Dawy, Sanaa SharafeddineAbstract:Due to the exploding traffic demands with the ubiquitous anticipated spread of 5G and Internet of Things, research has been active to devise mechanisms for meeting these demands while maintaining high Quality User Experience. In support of this direction, 3GPP is working towards cellular/WiFi interworking in heterogeneous networks to boost throughput, capacity, coverage and Quality of Experience. However, the continuous use of multiple wireless interfaces will increase the system performance but at the expense of more energy. As a result, there is a need for a dynamic use of multiple interfaces to provide a balance between energy consumption, throughput and User Experience. Previous work in this field has considered improving throughput and reducing energy consumption, but did not consider simultaneously Quality of Experience as perceived by the end User. In this work, we aim at devising real-time traffic splitting strategies between WiFi and cellular networks to maximize User Experience, reduce delay, and balance the needed energy consumption. We develop solutions for cellular/WiFi network resource management using Lyapunov drift-plus-penalty optimization approach. We evaluate the proposed approach using parameters determined via experimental measurements from mobile devices, and using our own test bed implementation to provide an evaluation under realistic operation conditions. Results show the performance effectiveness of the proposed traffic splitting approach in terms of throughput, delay, queue stability, energy consumption and Quality of User Experience by monitoring the frequency and lengths of video stalls.
Mohammad Mushfiqur Rahman Remans - One of the best experts on this subject based on the ideXlab platform.
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User Experience Study of 360° Music Videos on Computer Monitor and Virtual Reality Goggles
2019 23rd International Conference Information Visualisation (IV), 2019Co-Authors: Jukka Holm, Kaisa Väänänen, Mohammad Mushfiqur Rahman RemansAbstract:360° videos are increasingly used for media and entertainment, but the best practices for editing them are not yet well established. In this paper, we present a study in which we investigated the User Experience of 360° music videos viewed on computer monitor and VR goggles. The research was conducted in the form of a laboratory experiment with 20 test participants. During the within-subject study, participants watched and evaluated four versions of the same 360° music video with a different cutting rate. Based on the results, an average cutting rate of 26 seconds delivered the highest-Quality User Experience both for computer monitor and VR goggles. The cutting rate matched with participants' mental models, and there was enough time to explore the environment without getting bored. Faster cutting rates made the Users nervous, and a video consisting of a single shot was considered to be too static and boring.
Pardha S. Pyla - One of the best experts on this subject based on the ideXlab platform.
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the ux book process and guidelines for ensuring a Quality User Experience
2012Co-Authors: Rex Hartson, Pardha S. PylaAbstract:This is a comprehensive textbook on designing interaction to ensure a Quality User Experience. Combining breadth, depth, and practical applications, this book takes a time-tested process-and-guidelines approach that provides readers with actionable methods and techniques while retaining a firm grounding in HCI concepts and theory. The authors will guide you through the UX lifecycle process, including contextual inquiry and analysis, requirements extraction, design ideation and creation, practical design production, prototyping, and UX evaluation. Development activities are linked via handoffs between stages as practitioners move through the process. The lifecycle template concept introduced in this book can be tailored to any project environment, from large enterprise system development to commercial products. Students and practitioners alike will come away with knowledge and understanding of how to create and refine interaction designs to ensure a Quality User Experience. For more information see theuxbook.com*A very broad approach to User Experience through its components-usability, usefulness, and emotional impact with special attention to lightweight methods such as rapid UX evaluation techniques and an agile UX development process *Universal applicability of processes, principles, and guidelines-not just for GUIs and the Web, but for all kinds of interaction and devices: embodied interaction, mobile devices, ATMs, refrigerators, and elevator controls, and even highway signage *Extensive design guidelines applied in the context of the various kinds of affordances necessary to support all aspects of interaction *Real-world stories and contributions from accomplished UX practitioners *A practical guide to best practices and established principles in UX *Alifecycle template that can be instantiated and tailored to a given project, for a given type of system development, on a given budget.
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The UX Book: Process and Guidelines for Ensuring a Quality User Experience
The UX Book: Process and Guidelines for Ensuring a Quality User Experience, 2012Co-Authors: Rex Hartson, Pardha S. PylaAbstract:The UX Book, winner of a 2013 Most Promising New Textbook Award from the Text and Academic Authors Association, is a comprehensive textbook on designing interaction to ensure a Quality User Experience. Combining breadth, depth, and practical applications, this book takes a time-tested process-and-guidelines approach that provides readers with actionable methods and techniques while retaining a firm grounding in human-computer interaction (HCI) concepts and theory. The authors will guide you through the UX lifecycle process, including contextual inquiry and analysis, requirements extraction, design ideation and creation, practical design production, prototyping, and UX evaluation. Development activities are linked via handoffs between stages as practitioners move through the process. The lifecycle template concept introduced in this book can be tailored to any project environment, from large enterprise system development to commercial products. Students and practitioners alike will come away with understanding of how to create and refine interaction designs to ensure a Quality User Experience. For more information see theuxbook.com. A very broad approach to User Experience through its components-usability, usefulness, and emotional impact with special attention to lightweight methods such as rapid UX evaluation techniques and an agile UX development process. Universal applicability of processes, principles, and guidelines-not just for GUIs and the Web, but for all kinds of interaction and devices: embodied interaction, mobile devices, ATMs, refrigerators, and elevator controls, and even highway signage. Extensive design guidelines applied in the context of the various kinds of affordances necessary to support all aspects of interaction. Real-world stories and contributions from accomplished UX practitioners. A practical guide to best practices and established principles in UX. A lifecycle template that can be instantiated and tailored to a given project, for a given type of system development, on a given budget. © 2012 Elsevier Inc. All rights reserved.
Shuayb Zarar - One of the best experts on this subject based on the ideXlab platform.
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Packet loss concealment with recurrent neural networks for wireless inertial pose tracking
2018 IEEE 15th International Conference on Wearable and Implantable Body Sensor Networks (BSN), 2018Co-Authors: Xuesu Xiao, Shuayb ZararAbstract:Inertial sensing is a technology that enables motion capture outside of well-defined studio environments. Yet, there are several hurdles that have to be overcome in order to achieve a high-Quality User Experience. Among them is enabling robust wireless communication. Thanks to strict requirements on throughput and far-field operation along with existing issues of occlusion and client interference, packet-loss rates in wireless inertial-sensing systems can amplify pose-tracking errors by as much as 39%. In this paper, we develop a new type of sequence-predictors based on long short-term memory neural networks that can be used to significantly conceal packet losses for inertial pose-tracking. To lower computational overheads, we systematically exploit spatio-temporal correlations of data and distribute sensor loads among multiple predictors. Through experiments conducted with 3.5 hrs. of high-frequency inertial motion-capture data, we demonstrate that our approach is able to fully conceal packet losses at rates of up to 20%.
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BSN - Packet loss concealment with recurrent neural networks for wireless inertial pose tracking
2018 IEEE 15th International Conference on Wearable and Implantable Body Sensor Networks (BSN), 2018Co-Authors: Xuesu Xiao, Shuayb ZararAbstract:Inertial sensing is a technology that enables motion capture outside of well-defined studio environments. Yet, there are several hurdles that have to be overcome in order to achieve a high-Quality User Experience. Among them is enabling robust wireless communication. Thanks to strict requirements on throughput and far-field operation along with existing issues of occlusion and client interference, packet-loss rates in wireless inertial-sensing systems can amplify pose-tracking errors by as much as 39%. In this paper, we develop a new type of sequence-predictors based on long short-term memory neural networks that can be used to significantly conceal packet losses for inertial pose-tracking. To lower computational overheads, we systematically exploit spatio-temporal correlations of data and distribute sensor loads among multiple predictors. Through experiments conducted with 3.5 hrs. of high-frequency inertial motion-capture data, we demonstrate that our approach is able to fully conceal packet losses at rates of up to 20%.
