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19th International Conference on Human-Computer Interaction, HCI International 2017

作者： He, Jiayuan Zhu, Xiangyang Jiang, Ning Department of Systems Design Engineering University of Waterloo Waterloo Canada State Key Lab of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9783319587493

Pattern recognition (PR) based myoelectric control could provide intuitive and dexterous control of advanced prostheses. Previous studies showed that the performance of finger movements was not as good as that of wrist movements. As electrode configuration plays an important role in classification performance, this study investigated the effect of the number of electrodes and their locations on finger movement classification. An electrode selection algorithm, sequential forward searching (SFS), was applied on the high density (HD) electrode grid with 192 monopolar electrodes. With the time domain (TD) feature and linear discriminant analysis (LDA), it was found that the error rate was dramatically decreased with the number of electrodes increasing from one to ten. Under the optimized electrode configuration, the error rate could be lower than 10% with 8 electrodes, and 5% with 18 electrodes. The importance of the electrodes was measured and the results showed that the effective site for classification was mainly located around the flexor digitorum superficialis and extensor digitorum communis. This study provides the guideline for optimal placement of electrodes in finger movement recognition, and potentially provide sufficient controllability of advance prostheses with individually articulated fingers. © Springer International Publishing AG 2017.

关键词： Electrodes

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Revisiting hovering: Interaction guides for interactive surfaces 12

Revisiting hovering: Interaction guides for interactive surf...

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7th ACM International Conference on Interactive Tabletops and Surfaces, ITS 2012

作者： Cheung, Victor Heydekorn, Jens Scott, Stacey Dachselt, Raimund Collaborative Systems Laboratory Systems Design Engineering University of Waterloo Waterloo ON Canada User Interface and Software Engineering Group Otto-von-Guericke-Universität Magdeburg Germany Interactive Media Lab. Technische Universität Dresden Dresden Germany

ISBN: (纸本)9781450312097

Current touch-based interactive surfaces rely heavily on a trial-and-error approach for guiding users through the interaction process. In contrast, the legacy WIMP (Windows, Icons, Menus, Pointer) paradigm employs various methods to provide user assistance. A commonly used strategy is the use of mouse hovering. This research explores how this strategy can be adapted and expanded to user interaction with interactive surfaces to provide user assistance as well as to help address common surface interaction issues, such as precisions. design dimensions and considerations are discussed, and potential hover interaction techniques are proposed. These techniques emphasize the use of animation to facilitate user engagement and improve the overall user experience. © 2012 Authors.

关键词： Animation

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Field emission properties of carbon nanotube arrays with defects and impurities

Field emission properties of carbon nanotube arrays with def...

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2008 NSTI Nanotechnology Conference and Trade Show, NSTI Nanotech 2008 Joint Meeting, Nanotechnology 2008

作者： Roy Mahapatra, D. Sinha, N. Melnik, R.V.N. Yeow, J.T.W. Department of Aerospace Engineering Indian Institute of Science Bangalore India Department of Systems Design Engineering University of Waterloo Waterloo ON Canada M2NeT Lab. Wilfrid Laurier University Waterloo ON Canada

ISBN: (纸本)9781420085075

It has been found experimentally that the results related to the collective field emission performance of carbon nanotube (CNT) arrays show variability. The emission performance depends on the electronic structure of CNTs (especially their tips). Due to limitations in the synthesis process, production of highly pure and defect free CNTs is very difficult. The presence of defects and impurities affects the electronic structure of CNTs. Therefore, it is essential to analyze the effect of defects on the electronic structure, and hence, the field emission current. In this paper, we develop a modeling approach for evaluating the effect of defects and impurities on the overall field emission performance of a CNT array. We employ a concept of effective stiffness degradation for segments of CNTs, which is due to structural defects. Then, we incorporate the vacancy defects and charge impurity effects in our Green's function based approach. Simulation results indicate decrease in average current due to the presence of such defects and impurities.

关键词： Carbon nanotubes

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Topic discovery from text using aggregation of different clustering methods 15th

Topic discovery from text using aggregation of different clu...

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15th Conference of the Canadian Society for Computational Studies of Intelligence, AI 2002

作者： Ayad, Hanan Kamel, Mohamed Pattern Analysis and Machine Intelligence Lab Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada

ISBN: (纸本)9783540479222

Cluster analysis is an un-supervised learning technique that is widely used in the process of topic discovery from text. The research presented here proposes a novel un-supervised learning approach based on aggregation of clusterings produced by different clustering techniques. By examining and combining two different clusterings of a document collection, the aggregation aims at revealing a better structure of the data rather than imposing one that is imposed or constrained by the clustering method itself. When clusters of documents are formed, a process called topic extraction picks terms from the feature space (i.e. the vocabulary of the whole collection) to describe the topic of each cluster. It is proposed at this stage to re-compute terms weights according to the revealed cluster structure. The work further investigates the adaptive setup of the parameters required for the clustering and aggregation techniques. Finally, a topic accuracy measure is developed and used along with the F-measure to evaluate and compare the extracted topics and the clustering quality (respectively) before and after the aggregation. Experimental evaluation shows that the aggregation can successfully improve the clustering quality and the topic accuracy over individual clustering techniques. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Cluster analysis

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Scanning Patterns with Ecological Displays when Abstraction Levels are Separated

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Proceedings of the Human Factors and Ergonomics Society Annual Meeting 1999年第3期43卷 163 - 167页

作者： Catherine M. Burns Cognitive Engineering Laboratory Department of Mechanical and Industrial Engineering University of Toronto Toronto CanadaNow at the Advanced Interface Design Laboratory Department of Systems Design Engineering University of Waterloo Waterloo Canada

Ecological interface design (EID) has shown success as an approach for interface design in the case of a process control microworld. However, in applying the EID approach to larger systems, questions of navigation and integration of abstract information arise. In this study, three ecological displays were developed for an industry-scale simulated power plant from an abstraction-decomposition model of that plant. In one of the displays, the abstraction levels were temporally separated. In the other two displays the abstraction levels were temporally integrated. When using the temporally separated display, subjects developed distinct temporal scanning patterns along the abstraction dimension. The nature and characteristic of the scanning patterns suggests that functional integration is an important design element when designing large ecological displays.

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Feature based decision fusion 2nd

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2nd International Conference on Advances in Pattern Recognition, ICAPR 2001

作者： Wanas, Nayer M. Kamel, Mohamed S. Pattern Analysis and Machine Intelligence lab Department of Systems Design Engineering University of Waterloo WaterlooONN2L-3G1 Canada

ISBN: (纸本)3540417672

In this paper we present a new architecture for combining classifiers. This approach integrates learning into the voting scheme used to aggregate individual classifiers decisions. This overcomes the drawbacks of having static voting techniques. The focus of this work is to make the decision fusion a more adaptive process. This approach makes use of feature detectors responsible for gathering information about the input to perform adaptive decision aggregation. Test results show improvement in the overall classification rates over any individual classifier, as well as different static classifier-combining schemes. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Network architecture

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waterloo building dataset: a city-scale vector building dataset for mapping building footprints using aerial orthoimagery

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Geomatica 2022年第3期75卷 99-115页

作者： He, Hongjie Jiang, Zijian Gao, Kyle Fatholahi, Sarah Narges Tan, Weikai Hu, Bingxu Xu, Hongzhang Chapman, Michael A. Li, Jonathan Geospatial Sensing and Data Intelligence Lab Department of Geography and Environmental Management University of Waterloo WaterlooONN2L 3G1 Canada Department of Civil Engineering Ryerson University TorontoONM5B 2K3 Canada Department of Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada

Automated building footprint extraction is an important area of research in remote sensing with numerous civil and environmental applications. In recent years, deep learning methods have far surpassed classical algorithms when trained on appropriate datasets. In this paper, we present the waterloo building dataset for building footprint extraction from very high spatial resolution aerial orthoimagery. Our dataset covers the Kitchener–waterloo area in Ontario, Canada, contains 117 000 manually labelled buildings, and extends over an area of 205.8 km2. At a spatial resolution of 12 cm, it is the highest-resolution publicly available building footprint extraction dataset in North America. We provide extensive benchmarks for commonly used deep learning architectures trained on our dataset, which can be used as a baseline for future models. We also identified a key challenge in aerial orthoimagery building footprint extraction, which we hope can be addressed in future research. © Canadian Science Publishing. All rights reserved.

关键词： Buildings

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Intro to haptic communications for high school students

Intro to haptic communications for high school students

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IEEE International Conference on Robotics and Automation (ICRA)

作者： JingYing Chen M. Holbein J.S. Zelek Intelligent Human-Machine Interface Lab Systems Design Engineering University of Waterloo Waterloo ON Canada

Most haptic educational papers focus on using haptic devices as an aid to teaching. We introduced the use of vibro-tactile communication as well as tactile and kinesthetic sensing and their combination to high school students in order to introduce them to the field of haptics and its applications. The effectiveness of our approach for introducing the concepts as well as the technical issues associated with haptics to this age group was relatively successful. Initially, various physiological response properties of the human tactile system, including the kinesthetic component as well as the tactual (force, texture) properties were presented. The students were then exposed to theory, hardware (sensors, actuators) interfacing as well as the software to close the loop between sensing and haptic feedback after initially investigating open loop configurations. Vibro-tactile (i.e., pager motors) were used in the labs as chiefly communication devices to convey either pan-tilt from an accelerometer (kinesthetic) or the intensity of force exerted on a force pressure sensor. The students enjoyed the experience, especially the hands-on nature of the project and their only major complaint was that there was too much programming. Our future intent is to abstract the building blocks, simplify the software interfacing so as to allow students of various levels and capabilities to effectively be creative and imaginative in developing various haptic communication applications and tools

关键词： Haptic interfaces Educational institutions Force sensors Education Humans Hardware Actuators Feedback loop Accelerometers Programming profession

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An inverse problem approach to computational active depth from defocus 9

An inverse problem approach to computational active depth fr...

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9th International Conference on Inverse Problems in engineering, ICIPE 2017

作者： Ma, A. Wong, A. Vision and Image Processing Lab Systems Design Engineering University of Waterloo 200 University Ave W WaterlooONN2L 3G1 Canada

A novel methodology for inferring depth measurements using active quasi-random colored point projection patterns is presented by recourse to computational inverse modelling within the context of depth from defocus. The forward problem is considered that when capturing objects using a camera, light reflected off of objects at different depths will result in blurry observations in the acquired image, whereas the inverse problem seeks to estimate the depth from the knowledge of the blurry observations. In the proposed approach, a colored quasi-random point projection pattern is projected onto the scene of interest, and each projection point in the image captured by a cellphone camera is analyzed using an inverse model to estimate the depth at that point. The proposed method has a relatively simple setup, consisting of a camera and a projector, and enables depth inference from a single capture. We conclude with qualitative and quantitative results that highlight the strong potential for enabling active depth sensing in a simple, efficient manner. © Published under licence by IOP Publishing Ltd.

关键词： Inverse problems

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Tissue-Specific labelling using Temporal Feature Extraction in Photoacoustic Remote Sensing Microscopy

Tissue-Specific Labelling using Temporal Feature Extraction ...

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Clinical and Translational Biophotonics, Translational 2022

作者： Tweel, James Pellegrino, Nicholas Ecclestone, Benjamin R. Fieguth, Paul Reza, Parsin Haji PhotoMedicine Labs Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada Vision and Image Processing Lab Systems Design Engineering University of Waterloo WaterlooONN2L 3G1 Canada Illumisonics Inc. 22 King Street South WaterlooONN2J 1N8 Canada

Characteristic time-domain (TD) features are extracted from Photoacoustic Remote Sensing TD modulation using a novel temporal clustering algorithm. Features correspond to tissue-specific structures in unprocessed rese... 详细信息

ISBN: (纸本)9781557528209

关键词： Tissue

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