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2011 IEEE Global engineering Education Conference, EDUCON 2011

作者： Mota, Dulce Vaz De Carvalho, Carlos Reis, Luis Paulo GILT - Graphics Interaction and Learning Technologies Institute of Engineering Polytechnic of Porto Porto Portugal FEUP - Faculty of Engineering of the University of Porto Artificial Intelligence and Computer Science Lab. University of Porto Porto Portugal

ISBN: (纸本)9781612846439

This paper presents the Advanced Collaborative Educational Model (ACEM) for conception of collaborative learning activities. It is based on collaboration between teachers through virtual interactions, reutilization, interoperability and adaptability of learning activities. The definition of learning activity is oriented to a constructivist approach. Tagging collaboration and ontologies are also considered in order to facilitate sharing knowledge in a more effective and personalized way. The main goal of this research is to describe teachers' procedures when interacting with the collaborative environment and to develop mechanisms to support teachers in their tasks, mainly in the creation of learning activities to be used in an e-learning context. The model will be implemented through a high-level graphical tool that facilitates synchronous and asynchronous communication. © 2011 IEEE.

关键词： E-learning

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A numerical approach for nonlinear dynamical circuits with jumps

A numerical approach for nonlinear dynamical circuits with j...

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2011 20th European Conference on Circuit Theory and Design, ECCTD 2011

作者： Thiessen, Tina Gutschke, Martin Blanke, Philipp Mathis, Wolfgang Wolter, Franz-Erich Institute of Theoretical Electrical Engineering Leibniz University of Hannover D-30167 Leibniz Germany Welfenlab Division of Computer Graphics Leibniz University of Hannover D-30167 Leibniz Germany

ISBN: (纸本)9781457706189

A special class of nonlinear electronic circuits exhibits jump effects which occurs e.g. when the state space of an electronic system contains a fold. This can lead to difficulties during the simulation of these systems with standard circuit simulators. A common treatment to overcome these problems is to regularise these systems by adding suitably located parasitic inductors L's and capacitors C's. We propose a geometric approach and derive methods for solving circuit equations by means of algorithms from computational differential geometry. In this paper the geometric methods will be applied to an electronic multivibrator and numerical results will be presented. © 2011 IEEE.

关键词： Multivibrators

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Novel adaptive virtual channels technique for NoC switch

Novel adaptive virtual channels technique for NoC switch

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2011 IEEE 6th International Design and Test Workshop, IDT 2011

作者： Ezz-Eldin, Rabab El-Moursy, Magdy A. Refaat, Amr M. Electrical and Computer Engineering Department Bani-suef University Bani-suef Egypt Electronics Research Institute Cairo Egypt Mentor Graphics Corporation Cairo Egypt Electrical Engineering Department Fayoum University Fayoum Egypt

ISBN: (纸本)9781467304689

Adaptive Virtual Channel (AVC) is proposed as an efficient novel technique to reduce power dissipation of NoC switch. The proposed NoC switch employs power supply gating to reduce the power dissipation without degrading network performance. Hierarchical multiplexing tree is used to achieve efficient AVC. AVC uses hierarchical multiplexing tree and power gating mechanism to reduce both dynamic and leakage power dissipation of the switch. AVC technique is proposed to reduce the active area using hierarchical multiplexing tree. The dynamic power reduces by 60%. Using the leakage power reduction technique, the average leakage power consumption of Adaptive Virtual Channels is reduced by up to 97%. © 2011 IEEE.

关键词： Network-on-chip

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Design Management Review 2014年第3期25卷

作者： John Maeda Steven Heller Tim Hoover Has been a design partner at Kleiner Perkins Caufield & Byers since January 2014 helping entrepreneurs and portfolio companies to build design into their company cultures. He served as the president of Rhode Island School of Design for six years through 2013 and also served as an associate director of research at the MIT Media Lab. Maeda has been a practicing designer since 1990 and his work is in the permanent collections of the Museum of Modern Art San Francisco Museum of Modern Art and the Cartier Foundation. He serves on the boards of several corporations including Sonos and Wieden + Kennedy and is chair of eBay's Design Advisory Board. His four published books include The Laws of Simplicity and Redesigning Leadership. Maeda is the recipient of a variety of international awards for his creative work including induction into the Art Director's Club Hall of Fame. In 2001 he received the White House National Design Award in 2002 he received the Mainichi Design Prize in Japan and in 2005 he was awarded the Raymond Loewy Foundation Prize in Germany. Maeda earned a BS and an MS from MIT in computer science and electrical engineering. He received a PhD in design science from the University of Tsukuba Institute of Art and Design in Japan as well as an MBA from Arizona State University. Co‐chair and co‐founder of the MFA Designer as Author and Entrepreneur program at the School of Visual Arts in New York. He was the art director of The New York Times Book Review and now writes the VISUALS column for the NYTBR. He also writes “The Daily Heller” at *** a weekly online design column for Atlantic magazine. He is author co‐author and editor of more than 165 books on the history and practice of graphic design illustration and satiric art. His forthcoming books include 100 Classic Graphic Design Magazines (Laurence King Publishers) and Raw Data: The Process Behind Information Graphics (Thames + Hudson). Heller was the 2011 recipient of the Smithsonian National Design Award for Design Mind. He has also writ

John Maeda is a past president of Rhode Island School of Design and an internationally known designer. He's now involved in helping entrepreneurs build design into their company cultures. Writer and educator Steven Heller pairs up with Tim Hoover, head of product and design at Canary, to talk about designer CEOs, start‐ups, and cutting out the middleman.

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CHANTI: Predictive text entry using Non-verbal Vocal Input 11

CHANTI: Predictive text entry using Non-verbal Vocal Input

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Proceedings of the SIGCHI Conference on Human Factors in Computing Systems

作者： Sporka, Adam J. Felzer, Torsten Kurniawan, Sri H. Poláček, Ondřej Haiduk, Paul MacKenzie, I. Scott Department of Computer Graphics and Interaction Faculty of Electrical Engineering Czech Technical University in Prague Prague Czech Republic Institute for Mechatronic Systems Technische Universität Darmstadt Darmstadt Germany Department of Computer Engineering University of California Santa Cruz Santa Cruz CA United States Department of Psychology Technische Universität Darmstadt Darmstadt Germany Department of Computer Science and Engineering York University Toronto ON Canada

ISBN: (纸本)9781450302289

This paper introduces a text entry application for users with physical disabilities who cannot utilize a manual keyboard. The system allows the user to enter text hands-free, with the help of "Non-verbal Vocal Input" (e.g., humming or whistling). To keep the number of input sounds small, an ambiguous keyboard is used. As the user makes a sequence of sounds, each representing a subset of the alphabet, the program searches for matches in a dictionary. As a model for the system, the scanning-based application QANTI was redesigned and adapted to accept the alternative input signals. The usability of the software was investigated in an international longitudinal study done at locations in the Czech Republic, Germany, and the United States. Eight test users were recruited from the target community. The users differed in the level of speech impairment. Three users did not complete the study due to the severity of their impairment. By the end of the experiment, the users were able to enter text at rates between 10 and 15 characters per minute. Copyright 2011 ACM.

关键词： Human computer interaction

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$\hbox{MAWA}^{\ast}$—A Memory-Bounded Anytime Heuristic-Search Algorithm

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IEEE Transactions on Systems, Man, and Cybernetics, Part B (Cybernetics) 2011年第3期41卷 725-735页

作者： Satya Gautam Vadlamudi Sandip Aine Partha Pratim Chakrabarti Department of Computer Science and Engineering Indian Institute of Technology Kharagpur Kharagpur India Mentor Graphics Private Limited San Jose CA USA

This paper presents a heuristic-search algorithm called Memory-bounded Anytime Window A*(MAWA*), which is complete, anytime, and memory bounded. MAWA* uses the window-bounded anytime-search methodology of AWA* as the basic framework and combines it with the memory-bounded A* -like approach to handle restricted memory situations. Simple and efficient versions of MAWA* targeted for tree search have also been presented. Experimental results of the sliding-tile puzzle problem and the traveling-salesman problem show the significant advantages of the proposed algorithm over existing methods.

关键词： Heuristic algorithms Memory management Algorithm design and analysis Cybernetics Search problems Data structures

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A thinning-based liver vessel skeletonization method

A thinning-based liver vessel skeletonization method

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2011 International Conference on Internet Computing and Information Services, ICICIS 2011

作者： Chen, Yufei Drechsler, Klaus Zhao, Weidong Laura, Cristina Oyarzun Post-doctoral Research Center of Control Science and Engineering Tongji University Shanghai 200092 China Research Center of CAD Tongji University Shanghai 200092 China Fraunhofer Institute for Computer Graphics Research Cognitive Computing and Medical Imaging 64283 Darmstadt Germany

ISBN: (纸本)9780769545394

In the clinical practice of diagnosis and treatment of liver disease, how to effectively represent and analyze the vascular structure has been a widely studied topic for a long time. In this paper, we propose a method for the three dimensional skeletal graph generation of liver vessels using 3D thinning algorithm and graph theory. First of all, the principal methods for skeletonization are introduced, followed by their comparative analysis. Secondly, the 3D thinning-based skeletonization method together with a filling hole pre-processing on liver vessel image are employed to form the liver skeleton. A graph-based technique is then employed on the skeleton image to efficiently form the liver vascular graph. The thinning-based liver vessel skeletonization method was evaluated on liver vessel images with other two kinds of skeletonization approaches to show its effectiveness and efficiency. © 2011 IEEE.

关键词： Graph theory

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Liver vessel tree generation based on skeletonization and graph representation

Liver vessel tree generation based on skeletonization and gr...

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5th International Conference on Bioinformatics and Biomedical engineering, iCBBE 2011

ISBN: (纸本)9781424450893

Liver vessel tree generation is of importance for liver disease diagnosis and surgery plan. In this paper, we propose a method for generation of the liver vessel tree based on skeletonization and graph representation. First of all, basic methodology in the proposed method is introduced. Secondly, the 3D-thinning skeletonization algorithm together with the graph-based technique are employed on the liver vasculature to form an undirected cyclic graph. Thirdly, a new flow conservation based approach is applied to efficiently prune the graph into a directed acyclic tree. Experiments on a variety of liver CT datasets show the effectiveness and efficiency of the proposed method. © 2011 IEEE.

关键词： Flow graphs

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Needle-stability maps for brain-tumor biopsies

Needle-stability maps for brain-tumor biopsies

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15th International Conference on System Theory, Control and Computing, ICSTCC 2011

作者： Herghelegiu, Paul Manta, Vasile Gröpller, Eduard Faculty of Automatic Control and Computer Engineering Technical University Gheorghe Asachi Iasi Str. Prof. dr. doc. Dimitrie Mangeron 27 700050 Iasi Romania Vienna University of Technology Institute of Computer Graphics and Algorithms Favoritenstr. 9/5. Stock A-1040 Vienna Austria

ISBN: (纸本)9781457711732

Minimally invasive surgical procedures like biopsies require the insertion of a needle to reach a specific tissue from where samples are taken. This process is affected by a number of errors that can lead to a different needle pathway than originally planned. In the case of brain-tumor biopsies, these errors can be caused by the brain shifting when the skull is drilled, measurement errors due to the physical framework that supports the biopsy needle or some other human errors. To provide support for preoperative planning, we introduce the concept of a biopsy-needle stability-map. This map provides information on how stable a biopsy-needle pathway is. We also introduce an algorithm for finding the reachable points on the tumor border from one specific entry point. A technique for automatically selecting the needle pathway that offers the biggest minimal distance to any blood vessel is also presented. A 3D representation of the regions of interest (tumor, blood vessels) together with the needle pathway and the reachable points of the tumor has also been implemented. The resulting stability map visually represents, using color-coding, how close to any blood vessel the pathways surrounding the main one are. © 2011 Faculty of Auto Control.

关键词： Needles

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Freehand 3D Ultrasound Reconstruction for Image-Guided surgery

Freehand 3D Ultrasound Reconstruction for Image-Guided surge...

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2011 International Symposium on Bioelectronics and Bioinformatics(第二届国际生物医学电子学与生物信息学学术会议 ISBB 2011)

作者： WenJian Qin Lei Wang Jia Gu Tao Qiu Tiexiang Wen Institute of Biomedical and Health Engineering Shenzhen Institute of Advanced Technology (SIAT) Chi SIAT. His research interests are medical image processing and computer graphics

Three-dimensional (3D) ultrasound (US) is increasingly being introduced in the clinic, both for diagnostics and image guidance. Obtaining 3D volumes with 2D US probes is a two-step process. First, a positioning sensor must be attached to the probe;second, a reconstruction of a 3D volume can be performed into a regular voxel grid. Various algorithms have been used for performing 3D reconstruction based on 2D images. In this paper, we propose a new Hole-filling algorithm using Distance Weight interpolation, and we also apply it to generate the volume in our Image-guided for surgical robot. First, the ultrasound frames and position information are compounded into a 3D volume using the Bin-filling method. Then, the Hole-filling method is used to repair gaps in the volume. We define the empty voxels by sorting the neighboring voxels into three parts, and averaging them to obtain the value to fill the empty voxels according to distance weighted. The empty voxel estimation can be improved by thresholding the range width of its neighboring voxels and adjusting it to the average values. The method is tested on a Hole-manipulated volume derived from a cropped 3D ultrasound volume of chicken kidney. Our method shows improved result compared to several tested existing methods, including voxel nearest neighbour(VNN) and spline function interpolation.

关键词： Three dimensional displays Ultrasonic imaging Image reconstruction Interpolation Probes Kidney Imaging

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