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Construct3D: A virtual reality application for mathematics and geometry education

Education and Information Technologies 2000年第4期5卷 263-276页

作者： Kaufmann, Hannes Schmalstieg, Dieter Wagner, Michael Institute of Geometry Vienna University of Technology Austria 3370 Ybbs/Donau Lange Gasse 3 Austria Institute of Computer Graphics Vienna University of Technology Austria Department of Computer Science and Engineering Arizona State University United States

Construct3D is a three dimensional geometric construction tool based on the collaborative augmented reality system 'Studierstube'. Our setup uses a stereoscopic head mounted display (HMD) and the Personal Interaction Panel (PIP) - a two-handed 3D interaction tool that simplifies 3D model interaction. Means of application in mathematics and geometry education at high school as well as university level are being discussed. A pilot study summarizes the strengths and possible extensions of our system. Anecdotal evidence supports our claim that the use of Construct3D is easy to learn and encourages experimentation with geometric constructions. © 2000 Kluwer Academic Publishers.

关键词： 3D modelling Enhancing spatial abilities Geometry education User-interface design Virtual reality

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THE VERSATILITY OF AUTOMATIC MESH GENERATORS BASED ON TREE-STRUCTURES AND ADVANCED GEOMETRIC CONSTRUCTS

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COMMUNICATIONS IN APPLIED NUMERICAL METHODS 1988年第3期4卷 379-392页

作者： SHEPHARD, MS BAEHMANN, PL GRICE, KR Center for Interactive Computer Graphics Rensselaer Polytechnic Institute Troy NY 12180-3590 U.S.A. Associate Professor Department of Mechanical and Civil Engineering. Research Engineer.

AbstractThe ability of the finite octree and finite quadtree automatic mesh generators to satisfy effectively a wide variety of meshing capabilities is demonstrated. Areas considered include the ability to integrate easily with geometric modelling systems, versatile interactive mesh control functions, the ability to reorder unknowns directly from the finite element data structure and the ability to support automated finite element modelling.

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Stability analysis for the generalized Hopfield neural networks with multi-level activation functions

Stability analysis for the generalized Hopfield neural netwo...

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作者： Liu, Yiguang You, Zhisheng Institute of Image and Graphics Key Laboratory of Fundamental Synthetic Vision Graphics and Image for National Defense Sichuan University Chengdu 610064 China School of Computer Science and Engineering Sichuan University Chengdu 610064 China

Using the continuity property of neuron state variables and Lyapunov functional, this paper religiously gives sufficient conditions ensuring the equilibrium number, local stable state number, global stability and complete stability of the Hopfield neural networks with multi-level activation functions. Compared with the known relevant literatures, the obtained results are more precise. Finally, three examples are employed to illustrate the obtained criteria. © 2008 Elsevier B.V. All rights reserved.

关键词： Hopfield neural networks

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Reaction to directional vibrations applied on a joystick 19th

Reaction to directional vibrations applied on a joystick

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19th International Conference on New Trends in Civil Aviation, NTCA 2017

作者： Zikmund, P. Macík, M. Míkovec, Z. Institute of Aerospace Engineering Faculty of Mechanical Engineering Brno University of Technology Czech Republic Department of Computer Graphics and Interaction Czech Technical University in Prague Czech Republic

ISBN: (纸本)9780815376026

Human factor is the most common reason for aircraft accident. Therefore, an improvement of pilot–aircraft interaction by vibrotactile feedback is a way of increasing the safety of flight. This study focuses on the ability of pilot to distinguish directional vibration of a control stick and react in a specific direction. To investigate the intuitive reaction of a pilot on directional vibration, human–machine experiment was carried out. For the experiment, aircraft control stick was replaced by a joystick. The task involved the reaction to the directional vibrations of segments mounted on the joystick by an intuitive reaction. A hypothesis that a human can distinguish directional vibration of the control stick and react in specific directions was confirmed with an error rate of approximately 5%. The experiment was carried out with a prescribed way of holding the joystick in hand. This fact limits results generalization. Future work aims at designing new feedback hardware and analyzing the influence of different ways of stick holding. © 2018 Taylor & Francis Group, London.

关键词： Aircraft control

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Functional modelling and simulation of overall system ship-virtual methods for engineering and commissioning in shipbuilding 29

Functional modelling and simulation of overall system ship-v...

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29th European Conference on Modelling and Simulation, ECMS 2015

作者： Berndt, Olaf Von Lukas, Uwe Freiherr Kuijper, Arjan Fraunhofer Institute for Computer Graphics Research IGD Joachim-Jungius-Straße 11 Rostock18059 Germany University of Rostock Faculty of Computer Science and Electrical Engineering Albert-Einstein-Str. 22 Rostock18059 Germany Fraunhofer Institute for Computer Graphics Research IGD Fraunhoferstr. 5 Darmstadt64283 Germany

ISBN: (纸本)9780993244001

Shipbuilding industry is undergoing a change, in which many European shipyards focus on special purpose vessels. This field of shipbuilding places very high demands on engineering, commissioning and operation of the vessels. To support these fields of activity with virtual methods an innovative approach is introduced which strengthens the shipbuilding process by using a uniform common model of the overall system ship. The model is steadily increasing and gets more detailed through the phases of the shipbuilding. The presented approach fills the gap in the virtual support of the complete shipbuilding process, taking into account the specific structural needs-short time, high cost pressure and high quality demands. © ECMS Valeri M. Mladenov, Petia Georgieva, Grisha Spasov, Galidiya Petrova (Editors).

关键词： Shipbuilding

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The role of social context in human-robot interaction

The role of social context in human-robot interaction

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2nd International Conference of Southeast Asian Network of Ergonomics Societies, SEANES 2012

作者： Xu, Qianli Ng, Jamie Cheong, Y.L. Tan, Odelia Wong, J.B. Tay, T.C. Park, Taezoon Institute for Infocomm Research Computer Graphics and Interface Department A STAR Singapore Singapore School of Mechanical and Aerospace Engineering Nanyang Technological University Singapore

ISBN: (纸本)9781467317344

Users' experience of interacting with a robot is mediated by the context that characterizes the co-existence of the human and the robot. However, it has been difficult to study the role of social context in human-robot interaction (HRI) in experimental settings. In this research, we evaluated how social context influenced user acceptance of social robots in a controlled experiment. Using video scenarios with low- and high-level of contextual information, we examined the role of social context in modulating user acceptance. We found that user acceptance of the robot was contingent on the social context, and that information related to social context influenced the amount of user feedback generated by the users concerning the characteristics of social robots. © 2012 IEEE.

关键词： Human robot interaction

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iFall - A new embedded system for the detection of unexpected falls

iFall - A new embedded system for the detection of unexpecte...

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2010 8th IEEE International Conference on Pervasive Computing and Communications Workshops, PERCOM Workshops 2010

作者： Salomon, Ralf Luder, Marian Bieber, Gerald University of Rostock Faculty of Computer Science and Electrical Engineering 18051 Rostock Germany Fraunhofer-Institute for Computer Graphics Rostock Joachim-Jungius-Strasse 11 18059 Rostock Germany

ISBN: (纸本)9781424466054

This paper describes a new embedded system, called iFall, for the detection of unexpected falls for elderly people. In combination with a new sensors system and the monitoring of its own rotation, iFail is able to detect a fall in its very beginning. It is thus able to initiate some emergency actions, such as inflating a tiny airbag, in order to alleviate a fall's consequences, primarily potential injuries. In that respect, iFail is unique. It's physical properties, such as size, weight, and energy resources, make it almost invisible, so that it can be worn at any time at any occasion by any person. © 2010 IEEE.

关键词： Embedded systems

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Efficient real-time shadows 13

Efficient real-time shadows

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ACM Special Interest Group on computer graphics and Interactive Techniques Conference, SIGGRAPH 2013

作者： Eisemann, Elmar Assarsson, Ulf Schwarz, Michael Valient, Michal Wimmer, Michael Delft University of Technology Netherlands Department of Computer Science and Engineering Chalmers University Sweden Guerrilla Games / Sony Computer Entertainment Netherlands Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

ISBN: (纸本)9781450323390

This course provides an overview of efficient, real-time shadow algorithms. It presents the theoretical background but also discusses implementation details for facilitating efficient realizations (hard and soft shadows, volumetric shadows, reconstruction techniques). These elements are of relevance to both experts and practitioners. The course also reviews budget considerations and analyzes performance trade-offs, using examples from various AAA game titles and film previsualization tools. While physical accuracy can sometimes be replaced by plausible shadows, especially for games, film production requires more pecision, such as scalable solutions that can deal with highly detailed *** course builds upon earlier SIGGRAPH courses as well as the recent book Real-Time Shadows (A K Peters, 2011) by four of the instructors (due to its success, a second edition is planned for 2014). And with two instructors who have worked on AAA game and movie titles, the course presents interesting behindthe-scenes information that illuminates key topics.

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Design activity worksheets for developing research questions

Design activity worksheets for developing research questions

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2020 ASEE Virtual Annual Conference, ASEE 2020

作者： Byrd, Vetria Camba, Jorge D. Purdue University-Main Campus College of Engineering West Lafayette United States Department of Computer Graphics Technology Polytechnic Institute Purdue University West LafayetteIN United States Department of Computer Graphics Technology Purdue University West LafayetteIN United States

Developing good research questions is a skill that develops over time and is often difficult for students. More often than not, it is up to the student to determine what to research. Where do I start? What do I look for? Is this a good research question? These are just a few of the questions students ask and should ask in the early stages of their research process. This work describes a progressive plan for developing research questions using a series of four design activity worksheets to guide students through the cognitive and metacognitive processes of choosing topics, asking questions, identifying an appropriate problem and locating adequate data sources. The worksheets are introduced in a linear manner and completed in order. This progressive path is intended to provide a logical and methodical approach for developing research questions. However, each worksheet can be completed independently. The worksheets can also be used as a pedagogical approach to introduce research methods into the classroom. The design activity worksheets have been used in multiple venues: undergraduate and graduate data visualization courses, workshops and more recently, a graduate seminar designed to help students identify their thesis topics in partial fulfillment of their graduate degree. In this work, we describe the development and characteristics of the worksheets and report some preliminary results of a study designed to assess their perceived impact and usefulness from a student's perspective. © American Society for engineering Education 2020.

关键词： Students

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CLOTHING RETRIEVAL BASED ON IMAGE BUNDLED FEATURES

CLOTHING RETRIEVAL BASED ON IMAGE BUNDLED FEATURES

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2012 IEEE 2nd International Conference on Cloud Computing and Intelligence Systems

作者： Qijin Chen Jituo Li Guodong Lu Xinyu Bi Bei Wang Institute of Engineering & Computer Graphics Zhejiang University

How to evaluate the similarity between two clothing images is the core technical problem of image based clothing retrieval which is extremely useful in aiding online clothing shopping. According to the characteristics of clothing, we address this issue by computing the similarities between the bundled features of different clothing images. Each bundled feature consists of the point features (SIFT) which are further quantified into local visual words in a maximally stable extremal region (MSER). Researches show that bundled feature becomes much more discriminative than single feature, while the intrinsic geometric constraint of a bundled feature is still defective. In this paper, we add a geometric constraint by SIFTs distance matrix to improve the discriminative power. SIFTs distance matrix is constructed by the distances between every two point features (SIFT) in a bundled feature;it has its merits of scale invariance and rotation invariance. Thus, we can match the bundled features of two clothing images and calculate their similarity. Experimental results based on the clothing image database show that our approach works well in the situations with large clothing deformation, background exchange and part hidden, etc.

关键词： Clothing retrieval Image similarity SIFTs distance matrix Bundled feature

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