Ziying Tang

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Sen Hirano

University of California, Irvine

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University of Waterloo

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TECNALIA Research

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Bielefeld University

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University of Kent

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University of Pittsburgh

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Papers by Ziying Tang

Portable Context Aware Assistive Solution to Aid Independent Living for People with Autism

Oftentimes individuals on the Autism spectrum need substantial amounts of prompts to help them le... more Oftentimes individuals on the Autism spectrum need substantial amounts of prompts to help them learn new skills, maintain acquired skills, stay focused, and resolve sensory-based challenges. To this effect, this research aims to develop an assistive application that provides scalable prompts based on contextual information such as location, time, user status, and user preference. A user-centered design approach is adopted to ensure that the design meets the special needs of the target population and their caregivers. Initial evaluation of a proof-of-concept prototype has been conducted and the result is promising.

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Comparison of Fuzzy Membership Functions for Value of Information Determination

Network-centric military operations are redefining information overload as military commanders an... more Network-centric military operations are redefining information overload as military commanders and staffs are inundated with vast amounts of information. Recent research has developed a fuzzy-based system to assign a Value of Information (VoI) determination for individual pieces of information. This paper presents an investigation on the effect of using triangular and trapezoidal fuzzy membership functions within the system.

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ARMStrokes

Proceedings of the 17th International ACM SIGACCESS Conference on Computers & Accessibility - ASSETS '15, 2015

In this paper, we present a novel smartphone-based rehabilitation approach called ARMStrokes that... more In this paper, we present a novel smartphone-based rehabilitation approach called ARMStrokes that provides real-time support for stroke survivors to complete rehabilitation exercises for upper extremity recovery. ARMStrokes allows stroke survivors to exercise through interactive games anytime and anywhere and receive instant feedback about the quality of their performance. Stroke survivors can also communicate with their therapists or physicians through the supporting web-based platform. Focus groups involving stroke survivors, caregivers, and therapists have been conducted to evaluate the system and the feedback is highly positive.

Collaborative Rehabilitation Support System: A Comprehensive Solution for Everyday Rehab

2015 IEEE International Symposium on Multimedia (ISM), 2015

Repetitive rehabilitation exercises on a regular basis are crucial for enhancing and restoring fu... more Repetitive rehabilitation exercises on a regular basis are crucial for enhancing and restoring functional ability and quality of life to those with cognitive and physical disabilities such as stroke. However, a good proportion of patients are often non-compliant to the repetitive exercise regimen prescribed by their therapists. This may be due to a variety of factors including lack of motivation. Although interactive gaming systems such as the Wii by Nintendo and haptic devices have been introduced to make repetitive actions more fun and engaging for typically functioning individuals, challenges still remain for those who have some impairment. Expensive and complicated gaming systems are still not widely used by those with disabilities. In addition, therapists and caregivers, who play an important role in rehabilitation, have not been sufficiently involved. To address these problems as they pertain to people with disabilities, we propose a collaborative rehabilitation support system (CRSS) where mobile-based interactive games are included. Through our approach, we expand in-home rehabilitation to self-rehabilitation which allows users to perform rehab anywhere and anytime. A pilot study involving stroke survivors, caregivers, therapists and physicians was conducted to evaluate our system, and users' feedback is highly positive.

Tuning fuzzy membership functions to improve value of information calculations

2014 IEEE Conference on Norbert Wiener in the 21st Century (21CW), 2014

A major tenet of the US Army's data-to-decision initiative and a primary challenge for military c... more A major tenet of the US Army's data-to-decision initiative and a primary challenge for military commanders and their staff is the ability to shorten the cycle time from data gathering to making decisions. Paramount to this process is the ability to better assess the applicability and relevance of information for decisions in complex military environments. Towards this end, the Army Research Laboratory, in collaboration with Towson University, has embarked on a research initiative to experimentally characterize how analysts perceive the value of information (VoI) and subsequently model and test solutions. This paper presents the process used to extend the current fuzzy VoI system to allow user-defined membership functions that consider various domain decompositions using both triangular and trapezoidal fuzzy sets, and the assessment of their efficacy to current military operations.

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Distributed Haptic Interactions with Physically Based 3D Deformable Models over Lossy Networks

IEEE Transactions on Haptics, 2013

Researchers have faced great challenges when simulating complicated 3D volumetric deformable mode... more Researchers have faced great challenges when simulating complicated 3D volumetric deformable models in hapticsenabled collaborative/cooperative virtual environments (HCVEs) due to the expensive simulation cost, heavy communication load, and unstable network conditions. When general network services are applied to HCVEs, network problems such as packet loss, delay, and jitter can cause severe visual distortion, haptic instability, and system inconsistency. In this paper, we propose a novel approach to support haptic interactions with physically based 3D deformable models in a distributed virtual environment. Our objective is to achieve real-time sharing of deformable and force simulations over general networks. Combining linear modal analysis and corotational methods, we can effectively simulate physical behaviors of 3D objects, even for large rotational deformations. We analyze different factors that influence HCVEs' performance and focus on exploring solutions for streaming over lossy networks. In our system, 3D deformation can be described by a fairly small amount of data (several KB) using accelerations in the spectral domain, so that we can achieve low communication load and effective streaming. We develop a loss compensation and prediction algorithm to correct the errors/distortions caused by network problem, and a force prediction method to simulate force at users' side to ensure the haptic stability and the visual and haptic consistency. Our system works well under both the client-server and the peer-to-peer distribution structures, and can be easily extended to other topologies. In addition to theoretical analysis, we have tested the proposed system and algorithms under various network conditions. The experimental results are remarkably good, confirming the effectiveness, robustness and validity of our approach.

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Real-time streaming for collaborative interactions

Fueled by the latest developments in network technologies, computer-assisted collaboration, which... more Fueled by the latest developments in network technologies, computer-assisted collaboration, which is based on multimedia streaming techniques, has grown phenomenally in recent years. Comparing to the traditional collaborative activities that mainly employ image, video, audio, or text to communicate, new media types such as 3D models and haptic (forces) can represent collaborations in a more realistic and comprehensive manner. My dissertation focuses on those new media and explores three important aspects of multimedia streaming. Particularly, the first work investigates how to transfer static 3D models over lossy network conditions without adding extra cost. We develop a receiver-based loss tolerance scheme that is capable of recovering the lost data when streaming 3D progressive meshes over lossy networks, and suggest a linear prediction method to handle loss of structural and geometric data on the client/receiver side. Our approach works without any data retransmission and does no...

A multimodal virtual environment for interacting with 3d deformable models

Proceedings of the international conference on Multimedia - MM '10, 2010

... for Interacting with 3D Deformable Models Ziying Tang, Anant Patel, Xiaohu Guo, BalakrishnanP... more

Virtual rehabilitation system

Proceedings of the ACM international conference on Health informatics - IHI '10, 2010

Page 1. Virtual Rehabilitation System Ziying Tang, Xiaohu Guo and BalakrishnanPrabhakaran Compute... more

Streaming 3D shape deformations in collaborative virtual environment

2010 IEEE Virtual Reality Conference (VR), 2010

Collaborative virtual environment has been limited on static or rigid 3D models, due to the diffi... more Collaborative virtual environment has been limited on static or rigid 3D models, due to the difficulties of real-time streaming of large amounts of data that is required to describe motions of 3D deformable models. Streaming shape deformations of complex 3D models arising from a remote user's manipulations is a challenging task. In this paper, we present a framework based on spectral transformation that encodes surface deformations in a frequency format to successfully meet the challenge, and demonstrate its use in a distributed virtual environment. Our research contributions through this framework include: i) we reduce the data size to be streamed for surface deformations since we stream only the transformed spectral coefficients and not the deformed model; ii) we propose a mapping method to allow models with multi-resolutions to have the same deformations simultaneously; iii) our streaming strategy can tolerate loss without the need for special handling of packet loss. Our system guarantees real-time transmission of shape deformations and ensures the smooth motions of 3D models. Moreover, we achieve very effective performance over real Internet conditions as well as a local LAN. Experimental results show that we get low distortion and small delays even when surface deformations of large and complicated 3D models are streamed over lossy networks.

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Real-time 3D interaction with deformable model on mobile devices

Proceedings of the 19th ACM international conference on Multimedia - MM '11, 2011

Mobile-based augmented reality is an emerging technology that provides immersive experiences over... more Mobile-based augmented reality is an emerging technology that provides immersive experiences over wireless networks. Its applications, such as 3D streaming, have become more and more popular on mobile devices. However, most of these applications do not support real-time 3D interactions. Consequently, mobile users can only watch or browse 3D contents passively instead of actively interacting with 3D objects. In this

A Comprehensive Approach for Streaming 3D Progressive Meshes

2009 11th IEEE International Symposium on Multimedia, 2009

Fast and efficient streaming of detailed 3D model over lossy network has long been a challenge, a... more Fast and efficient streaming of detailed 3D model over lossy network has long been a challenge, although progressive compression techniques were proposed long time ago. One reason is that packet loss occurring in unreliable networks is highly unpredictable, and leads to connectivity inconsistency and distortions. In this paper, we address this problem by proposing a receiver-based loss tolerance scheme based on a prediction technique. Our method works without introducing protection bits and retransmission. We stream mesh refinement data on reliable and unreliable networks separately so as to reduce the transmission delay as well as to obtain a satisfactory decompression result. The tests indicate that the decompression is completed quickly, suggesting that it is a practical solution. Moreover, the proposed prediction technique achieves a good approximation of the original mesh with low distortion.

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CAD-VR geometry and meta data synchronization for design review applications

Journal of Zhejiang University SCIENCE A, 2006

In this paper we present the MEMPHIS middleware framework for the integration of CAD geometries a... more In this paper we present the MEMPHIS middleware framework for the integration of CAD geometries and assemblies with derived Virtual Reality (VR) models and its specific meta data and attributes. The goal of this work is to connect real time VR applications, especially for the Design Review, with enterprise software storing and managing CAD models (Product Data Management-PDM). The preparation of VR models requires expert knowledge, is time consuming, and includes selection of required CAD data, tessellation, healing of unwanted gaps, applying materials and textures, and special surface and light effects. During the Design Review process, decisions are made concerning the choice of materials and surface forms. While materials can be switched directly on the VR model, the modification of part geometries must be made on the CAD model. Our system synchronizes modifications of the original CAD geometries and of attributes that are relevant for the realistic rendering using the PLM Services standard. Thus, repeated work for the VR preparation can be avoided.

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Receiver-based loss tolerance method for 3D progressive streaming

Multimedia Tools and Applications, 2011

While progressive compression techniques were proposed long time ago, fast and efficient streamin... more While progressive compression techniques were proposed long time ago, fast and efficient streaming of detailed 3D models over lossy networks still remains a challenge. A primary reason is that packet loss occurring in unreliable networks is highly unpredictable, leading to connectivity inconsistency and distortions of decompressed meshes. Although prior researches have proposed various methods to handle errors caused by transmission

On supporting collaborative haptic interactions with physically-based 3D deformations

by Ziying Tang and Balakrishnan Prabhakaran

Haptic-enabled collaborative systems have long been limited to 3D rigid models only, primarily du... more Haptic-enabled collaborative systems have long been limited to 3D rigid models only, primarily due to slow force calculations, long-time deformable simulations and large communication loads. In this paper, we propose a novel system to support real-time sharing of haptic feedbacks and deformable simulations of physically-based 3D models in a distributed virtual environment. Particularly, adopting a spectral method, we can effectively

Portable Context Aware Assistive Solution to Aid Independent Living for People with Autism

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Comparison of Fuzzy Membership Functions for Value of Information Determination

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ARMStrokes

Proceedings of the 17th International ACM SIGACCESS Conference on Computers & Accessibility - ASSETS '15, 2015

Collaborative Rehabilitation Support System: A Comprehensive Solution for Everyday Rehab

2015 IEEE International Symposium on Multimedia (ISM), 2015

Tuning fuzzy membership functions to improve value of information calculations

2014 IEEE Conference on Norbert Wiener in the 21st Century (21CW), 2014

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Distributed Haptic Interactions with Physically Based 3D Deformable Models over Lossy Networks

IEEE Transactions on Haptics, 2013

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Real-time streaming for collaborative interactions

A multimodal virtual environment for interacting with 3d deformable models

Proceedings of the international conference on Multimedia - MM '10, 2010

... for Interacting with 3D Deformable Models Ziying Tang, Anant Patel, Xiaohu Guo, BalakrishnanP... more

Virtual rehabilitation system

Proceedings of the ACM international conference on Health informatics - IHI '10, 2010

Page 1. Virtual Rehabilitation System Ziying Tang, Xiaohu Guo and BalakrishnanPrabhakaran Compute... more

Streaming 3D shape deformations in collaborative virtual environment

2010 IEEE Virtual Reality Conference (VR), 2010

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Real-time 3D interaction with deformable model on mobile devices

Proceedings of the 19th ACM international conference on Multimedia - MM '11, 2011

A Comprehensive Approach for Streaming 3D Progressive Meshes

2009 11th IEEE International Symposium on Multimedia, 2009

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CAD-VR geometry and meta data synchronization for design review applications

Journal of Zhejiang University SCIENCE A, 2006

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Receiver-based loss tolerance method for 3D progressive streaming

Multimedia Tools and Applications, 2011

On supporting collaborative haptic interactions with physically-based 3D deformations

by Ziying Tang and Balakrishnan Prabhakaran

Ziying Tang

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