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Towards Neuroadaptive Augmented Reality Piano Tutorials 2

Towards Neuroadaptive Augmented Reality Piano Tutorials

2nd Edition IEEE International Conference on Metrology for eXtended Reality, Artificial Intelligence and Neural engineering, MetroXRAINE 2023

作者： Maitz, Florian Ribeiro Skreinig, Lucchas Kalkofen, Denis Wriessnegger, Selina C. Institute of Neural Engineering Graz University of Technology Graz Austria Institute of Computer Graphics and Vision Graz University of Technology Graz Austria

ISBN: (纸本)9798350300802

EEG-based neuro-adaptive systems are becoming increasingly popular in the field of learning and education. Their ability to detect changes in brain activity in real-time makes them unique and enables monitoring mental workload (MWL) and fatigue. We present a neuro-adaptive system that combines an Augmented Reality (AR) piano tutorial with online EEG measurements of its user, delivered by a passive Brain computer Interface (BCI) system. The MWL was measured by means of EEG and a Filter Bank Common Spatial Patter algorithm (FBCSP) was trained to differentiate between low and high levels of MWL. Low levels were connected to the 0-back task and high levels to the 2-back task. The n-back task was a calibration task to train a binary Machine Learning (ML) classifier to differentiate between low and high MWL. This trained ML algorithm was then used as the central element of the passive BCI, which constantly classified small windows of the EEG during the piano tutorial and adapted the difficulty of the tutorial. 22 Participants were randomly separated into two groups: adaptive and non-adaptive piano tutorial. The results of the non-adaptive group showed significantly higher levels of classified MWL throughout the piano tutorial. © 2023 IEEE.

关键词： EEG mental workload Mixed Reality passive BCI

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New discrepancy measure for evaluation of segmentation quality

New discrepancy measure for evaluation of segmentation quali...

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11th IASTED International Conference on computer graphics and Imaging, CGIM 2010

作者： Smochina, Cristian Manta, Vasile Rogojanu, Radu Department of Computer Science and Engineering Gheorghe Asachi Technical University of Iasi Romania Institute for Computer Graphics and Vision Graz University of Technology Austria

ISBN: (纸本)9780889868243

A new quality measure is proposed for evaluating the performance of segmentation algorithms. This discrepancy method is based on object-by-object comparison of a segmented image (machine segmentation) versus ground-truth segmentation (reference image). The error measure we propose offers two main advantages compared to other quality measures. The first advantage to mention is the use of alternative methods in computing the distance from the contour of the segmented object to the reference one. This method takes into consideration the interior of the object and eliminates the inconveniences that appear in the case of the concave objects. The second improvement comes from adding a weighted shape fitting score: the score of the segmented contour is enhanced by a factor which indicates the similarity between these two curves.

关键词： Image segmentation

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Variable neighborhood search for integrated timetable based design of railway infrastructure

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Electronic Notes in Discrete Mathematics 2015年 47卷 141-148页

作者： Grujičić, Igor Raidl, Günther Schöbel, Andreas Institute of Computer Graphics and Algorithms Vienna University of Technology Vienna Austria Institute of Transportation Research Centre for Railway Engineering Vienna University of Technology Vienna Austria

In this paper we deal with the problem of building new or extending an existing railway infrastructure. The goal is to determine a minimum cost infrastructure fulfilling the requirements defined by an integrated timetable and the operation of the railway system. We first model this planning task as a combinatorial network optimization problem, capturing the essential aspects. We then present a metaheuristic solution method based on general variable neighborhood search that makes use of a dynamic programming procedure for realizing individual connections. Computational experiments indicate that the suggested approach is promising and the analysis of obtained results gives useful hints for future work in this area. © 2014 Elsevier B.V.

关键词： Dynamic programming Integrated timetables Railway infrastructure design Variable neighborhood search

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AUTOMATIC MUCK PILE CHARACTERIZATION from UAV IMAGES 4

AUTOMATIC MUCK PILE CHARACTERIZATION from UAV IMAGES

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4th ISPRS Geospatial Week 2019

作者： Schenk, F. Tscharf, A. Mayer, G. Fraundorfer, F. Institute of Computer Graphics and Vision Graz University of Technology Austria Mining Engineering and Mineral Economics Montanuniversitaet Leoben Austria

In open pit mining it is essential for processing and production scheduling to receive fast and accurate information about the fragmentation of a muck pile after a blast. In this work, we propose a novel machine-learning method that characterizes the muck pile directly from UAV images. In contrast to state-of-the-art approaches, that require heavy user interaction, expert knowledge and careful threshold settings, our method works fully automatically. We compute segmentation masks, bounding boxes and confidence values for each individual fragment in the muck pile on multiple scales to generate a globally consistent segmentation. Additionally, we recorded lab and real-world images to generate our own dataset for training the network. Our method shows very promising quantitative and qualitative results in all our experiments. Further, the results clearly indicate that our method generalizes to previously unseen data. © Authors 2019.

关键词： Unmanned aerial vehicles (UAV)

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Adaptive parameterization for reconstruction of 3D freeform objects from laser-scanned data 7

Adaptive parameterization for reconstruction of 3D freeform ...

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7th Pacific Conference on computer graphics and Applications, Pacific graphics 1999

作者： Fischer, A. Manor, A. Barhak, Y. CMSR Laboratory for Computer Graphics and CAD Department of Mechanical Engineering Technion - Israel Institute of Technology Haifa32000 Israel

ISBN: (纸本)0769502938

This paper proposes a new adaptive parametrization method to overcome the problems of using laser scanners in Reverse engineering. The method is based on the following stages: (a) Detecting a 3D boundary of the parametric base surface by matching an intensity image from a CCD camera with the scanned data. (b) Adaptively reconstructing a parametric base surface with a non-self intersecting grid, based on a PDE method (c) Calculating the parametrization of the 3D sampled points. (d) Fitting the surface by applying a least square (LSQ) approximation method with boundary constraints. The feasibility of the parametrization algorithm is demonstrated on several examples using sculptured free objects. © 1999 IEEE.

关键词： Reverse engineering

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Current issues of developing methodology and software solutions used in different phases of modelling additive production processes

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Key engineering Materials 2018年第1期771卷 97-102页

作者： Ripetskiy, Andrey Vassilyev, Stanislav Zelenov, Sergey Kuznetsova, Ekaterina Department of Engineering and Computer Graphics Moscow Aviation Institute National Research University 4 Volokolamskoe highway Moscow125993 Russia Faculty of General Engineering Education Moscow Aviation Institute National Research University 4 Volokolamskoe highway Moscow125993 Russia Department of Engineering Graphics Moscow Aviation Institute National Research University 4 Volokolamskoe highway Moscow125993 Russia Faculty of Applied Mechanics Moscow Aviation Institute National Research University 4 Volokolamskoe highway Moscow125993 Russia

The mathematical methods and examples considered in the article allow efficient modeling of additive manufacturing processes by formulating a number of new criteria for geometry evaluation for compliance with the technological limitations of the additive manufacturing techniques. The aim of the research is the development of the new techniques, methods, algorithms and structured data aimed to validate the entire chain of additive manufacturing process. © 2018 Trans Tech Publications, Switzerland.

关键词： 3D printers

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The generalized minimum edge-biconnected network problem: *** neighborhood structures for variable neighborhood search

The generalized minimum edge-biconnected network problem: **...

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作者： Hu, Bin Leitner, Markus Raidl, Günther R. Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Department of Telematics and Network Engineering Carinthia University of Applied Sciences Austria

We consider the generalized minimum edge-biconnected network problem where the nodes of a graph are partitioned into clusters and exactly one node from each cluster is required to be connected in an edge-biconnected way. Instances of this problem appear, for example, in the design of survivable backbone networks. We present different variants of a variable neighborhood search approach that utilize different types of neighborhood structures, each of them addressing particular properties as spanned nodes and/or the edges between them. For themorecomplex neighborhood structures,weapply efficient techniques-such as a graph reduction-to essentially speedupthe search process. For comparison purposes, we use a mixed integer linear programming formulation based on multi-commodity flows to solve smaller instances of this problem to proven optimality. Experiments on such instances indicate that the variable neighborhood search is also able to identify optimal solutions in the majority of test runs, but within substantially less time. Tests on larger Euclidean and random instances with up to 1,280 nodes, which could not be solved to optimality by mixed integer programming, further document the efficiency of the variable neighborhood search. In particular, all proposed neighborhood structures are shown to contribute significantly to the search process. © 2009 Wiley Periodicals, Inc.

关键词： Integer programming

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Virtual Commissioning of Camera-based Quality Assurance Systems for Mixed Model Assembly Lines

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Procedia Manufacturing 2017年 11卷 914-921页

作者： Piero, Nils Schmitt, Michael Graduate School of Excellence advanced Manufacturing Engineering Uni Stuttgart Stuttgart 70569 Germany Fraunhofer Institute for Computer Graphics Research IGD Darmstadt 64283 Germany

We propose a new computer vision based technique that does not use data collected from real images to teach a decision-making algorithm. It uses CAD-Models which is already available from the product planning phase to check all product variants on the assembly line for misplaced or wrong components. This solution can hence be used already in the ramp-up phase of new models in which problems are more *** method can also easily adapt to changes of production, where existing methods need to redo the whole teach-in process, we just need to set the new nominal position of the part in the reference coordinate system, which can even be done semi automatically upfront the changes are initiated in the assembly line. © 2017 The Authors

关键词： Augmeented-Reality CAD-based computer Vision Mixed model assembly lines Quality assurance

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Perceptual issues in augmented reality revisited

Perceptual issues in augmented reality revisited

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9th IEEE International Symposium on Mixed and Augmented Reality 2010: Science and Technology, ISMAR 2010

作者： Kruijff, Ernst Swan II, J. Edward Feiner, Steven Institute for Computer Graphics and Vision Graz University of Technology Austria Department of Computer Science and Engineering Mississippi State University United States Department of Computer Science Columbia University United States

ISBN: (纸本)9781424493449

This paper provides a classification of perceptual issues in augmented reality, created with a visual processing and interpretation pipeline in mind. We organize issues into ones related to the environment, capturing, augmentation, display, and individual user differences. We also illuminate issues associated with more recent platforms such as handhelds or projector-camera systems. Throughout, we describe current approaches to addressing these problems, and suggest directions for future research. ©2010 IEEE.

关键词： Augmented reality

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Discovery of Novel Androgen Receptor Ligands by Structure-based Virtual Screening and Bioassays

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Genomics, Proteomics & Bioinformatics 2018年第6期16卷 416-427页

作者： Wenfang Zhou Mojie Duan Weitao Fu Jinping Pang Qin Tang Huiyong Sun Lei Xu Shan Chang Dan Li Tingjun Hou College of Pharmaceutical Sciences Zhejiang University State Key Laboratory of Computer Aided Design and Computer Graphics (CAD&GC) Zhejiang University State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics National Center for Magnetic Resonance in WuhanWuhan Institute of Physics and MathematicsChinese Academy of Sciences Institute of Bioinformatics and Medical Engineering School of Electrical and Information EngineeringJiangsu University of Technology

Androgen receptor(AR) is a ligand-activated transcription factor that plays a pivotal role in the development and progression of many severe diseases such as prostate cancer, muscle atrophy, and osteoporosis. Binding of ligands to AR triggers the conformational changes in AR that may affect the recruitment of coactivators and downstream response of AR signaling ***, AR ligands have great potential to treat these diseases. In this study, we searched for novel AR ligands by performing a docking-based virtual screening(VS) on the basis of the crystal structure of the AR ligand binding domain(LBD) in complex with its agonist. A total of 58 structurally diverse compounds were selected and subjected to LBD affinity assay, with five of them(HBP1-3, HBP1-17, HBP1-38, HBP1-51, and HBP1-58) exhibiting strong binding to AR-LBD. The IC50 values of HBP1-51 and HBP1-58 are 3.96 m M and 4.92 m M, respectively, which are even lower than that of enzalutamide(Enz, IC50= 13.87 m M), a marketed second-generation AR antagonist. Further bioactivity assays suggest that HBP1-51 is an AR agonist, whereas HBP1-58 is an AR antagonist. In addition, molecular dynamics(MD) simulations and principal components analysis(PCA) were carried out to reveal the binding principle of the newlyidentified AR ligands toward AR. Our modeling results indicate that the conformational changes of helix 12 induced by the bindings of antagonist and agonist are visibly different. In summary,the current study provides a highly efficient way to discover novel AR ligands, which could serve as the starting point for development of new therapeutics for AR-related diseases.

关键词： Androgen receptor AR ligand Virtual screening AR agonist AR antagonist

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